Merge branch 'master' into reorder-name-variants

2025-10-07 10:04:11 +00:00 · 2020-01-16 09:30:31 +01:00
parent 78f9d62e00 16831decca
commit 4c23d01567
44 changed files with 1915 additions and 170 deletions
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: required
-dist: trusty
+dist: bionic

 env:
  # Install the latest docker-compose version for ci testing.
@@ -12,6 +12,9 @@ env:
  DSPACE_REST_NAMESPACE: '/server/api'
  DSPACE_REST_SSL: false

+services:
+  - xvfb
+
 before_install:
  # Docker Compose Install
  - curl -L https://github.com/docker/compose/releases/download/${COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
@@ -33,14 +36,6 @@ before_script:
 after_script:
  - docker-compose -f ./docker/docker-compose-travis.yml down

-addons:
-  apt:
-    sources:
-      - google-chrome
-    packages:
-      - dpkg
-      - google-chrome-stable
-
 language: node_js

 node_js:
@@ -53,8 +48,6 @@ cache:
 bundler_args: --retry 5

 script:
-  # Use Chromium instead of Chrome.
-  - export CHROME_BIN=chromium-browser
  - yarn run build
  - yarn run ci
  - cat coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js
--- a/resources/i18n/en.json5
+++ b/resources/i18n/en.json5
@@ -1566,6 +1566,8 @@

  "search.results.no-results-link": "quotes around it",

+  "search.results.empty": "Your search returned no results.",
+


  "search.sidebar.close": "Back to results",
@@ -1639,13 +1641,21 @@

  "submission.sections.describe.relationship-lookup.selected": "Selected {{ size }} items",

-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Author": "Search for Authors",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Author": "Local Authors ({{ count }})",

-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal": "Search for Journals",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal": "Local Journals ({{ count }})",

-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Issue": "Search for Journal Issues",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Issue": "Local Journal Issues ({{ count }})",

-  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Volume": "Search for Journal Volumes",
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Journal Volume": "Local Journal Volumes ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.sherpaJournal": "Sherpa Journals ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.sherpaPublisher": "Sherpa Publishers ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.orcidV2": "ORCID ({{ count }})",
+
+  "submission.sections.describe.relationship-lookup.search-tab.tab-title.lcname": "LC Names ({{ count }})",

  "submission.sections.describe.relationship-lookup.search-tab.tab-title.Funding Agency": "Search for Funding Agencies",

@@ -1679,6 +1689,14 @@

  "submission.sections.describe.relationship-lookup.selection-tab.title.Journal Issue": "Selected Issue",

+  "submission.sections.describe.relationship-lookup.selection-tab.title.sherpaJournal": "Search Results",
+
+  "submission.sections.describe.relationship-lookup.selection-tab.title.sherpaPublisher": "Search Results",
+
+  "submission.sections.describe.relationship-lookup.selection-tab.title.orcidV2": "Search Results",
+
+  "submission.sections.describe.relationship-lookup.selection-tab.title.lcname": "Search Results",
+
  "submission.sections.describe.relationship-lookup.name-variant.notification.content": "Would you like to save \"{{ value }}\" as a name variant for this person so you and others can reuse it for future submissions? If you don\'t you can still use it for this submission.",

  "submission.sections.describe.relationship-lookup.name-variant.notification.confirm": "Save a new name variant",
--- a/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.html
+++ b/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.html
@@ -1,14 +1,13 @@
 <ng-container *ngVar="(subCollectionsRDObs | async) as subCollectionsRD">
  <div *ngIf="subCollectionsRD?.hasSucceeded && subCollectionsRD?.payload.totalElements > 0" @fadeIn>
    <h2>{{'community.sub-collection-list.head' | translate}}</h2>
-    <ul>
-      <li *ngFor="let collection of subCollectionsRD?.payload.page">
-        <p>
-          <span class="lead"><a [routerLink]="['/collections', collection.id]">{{collection.name}}</a></span><br>
-          <span class="text-muted">{{collection.shortDescription}}</span>
-        </p>
-      </li>
-    </ul>
+    <ds-viewable-collection
+      [config]="config"
+      [sortConfig]="sortConfig"
+      [objects]="subCollectionsRD"
+      [hideGear]="false"
+      (paginationChange)="onPaginationChange($event)">
+    </ds-viewable-collection>
  </div>
  <ds-error *ngIf="subCollectionsRD?.hasFailed" message="{{'error.sub-collections' | translate}}"></ds-error>
  <ds-loading *ngIf="subCollectionsRD?.isLoading" message="{{'loading.sub-collections' | translate}}"></ds-loading>
--- a/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.spec.ts
+++ b/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.spec.ts
@@ -0,0 +1,182 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { By } from '@angular/platform-browser';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+import { CommunityPageSubCollectionListComponent } from './community-page-sub-collection-list.component';
+import { Community } from '../../core/shared/community.model';
+import { SharedModule } from '../../shared/shared.module';
+import { CollectionDataService } from '../../core/data/collection-data.service';
+import { FindListOptions } from '../../core/data/request.models';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { SelectableListService } from '../../shared/object-list/selectable-list/selectable-list.service';
+
+describe('CommunityPageSubCollectionList Component', () => {
+  let comp: CommunityPageSubCollectionListComponent;
+  let fixture: ComponentFixture<CommunityPageSubCollectionListComponent>;
+  let collectionDataServiceStub: any;
+  let subCollList = [];
+
+  const collections = [Object.assign(new Community(), {
+    id: '123456789-1',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'Collection 1' }
+      ]
+    }
+  }),
+    Object.assign(new Community(), {
+      id: '123456789-2',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 2' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-4',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'Collection 7' }
+        ]
+      }
+    })
+  ];
+
+  const mockCommunity = Object.assign(new Community(), {
+    id: '123456789',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'Test title' }
+      ]
+    }
+  });
+
+  collectionDataServiceStub = {
+    findByParent(parentUUID: string, options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > subCollList.length) {
+        endPageIndex = subCollList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subCollList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        TranslateModule.forRoot(),
+        SharedModule,
+        RouterTestingModule.withRoutes([]),
+        NgbModule.forRoot(),
+        NoopAnimationsModule
+      ],
+      declarations: [CommunityPageSubCollectionListComponent],
+      providers: [
+        { provide: CollectionDataService, useValue: collectionDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+        { provide: SelectableListService, useValue: {} },
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(CommunityPageSubCollectionListComponent);
+    comp = fixture.componentInstance;
+    comp.community = mockCommunity;
+  });
+
+  it('should display a list of collections', () => {
+    subCollList = collections;
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(5);
+    expect(collList[0].nativeElement.textContent).toContain('Collection 1');
+    expect(collList[1].nativeElement.textContent).toContain('Collection 2');
+    expect(collList[2].nativeElement.textContent).toContain('Collection 3');
+    expect(collList[3].nativeElement.textContent).toContain('Collection 4');
+    expect(collList[4].nativeElement.textContent).toContain('Collection 5');
+  });
+
+  it('should not display the header when list of collections is empty', () => {
+    subCollList = [];
+    fixture.detectChanges();
+
+    const subComHead = fixture.debugElement.queryAll(By.css('h2'));
+    expect(subComHead.length).toEqual(0);
+  });
+
+  it('should update list of collections on pagination change', () => {
+    subCollList = collections;
+    fixture.detectChanges();
+
+    const pagination = Object.create({
+      pagination:{
+        id: comp.pageId,
+        currentPage: 2,
+        pageSize: 5
+      },
+      sort: {
+        field: 'dc.title',
+        direction: 'ASC'
+      }
+    });
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('Collection 6');
+    expect(collList[1].nativeElement.textContent).toContain('Collection 7');
+  });
+});
--- a/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.ts
+++ b/src/app/+community-page/sub-collection-list/community-page-sub-collection-list.component.ts
@@ -1,12 +1,16 @@
 import { Component, Input, OnInit } from '@angular/core';
-import { Observable } from 'rxjs';
+
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';

 import { RemoteData } from '../../core/data/remote-data';
 import { Collection } from '../../core/shared/collection.model';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeIn } from '../../shared/animations/fade';
 import { PaginatedList } from '../../core/data/paginated-list';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { CollectionDataService } from '../../core/data/collection-data.service';

@Component({
  selector: 'ds-community-page-sub-collection-list',
@@ -16,9 +20,60 @@ import { PaginatedList } from '../../core/data/paginated-list';
 })
 export class CommunityPageSubCollectionListComponent implements OnInit {
  @Input() community: Community;
-  subCollectionsRDObs: Observable<RemoteData<PaginatedList<Collection>>>;
+
+  /**
+   * The pagination configuration
+   */
+  config: PaginationComponentOptions;
+
+  /**
+   * The pagination id
+   */
+  pageId = 'community-collections-pagination';
+
+  /**
+   * The sorting configuration
+   */
+  sortConfig: SortOptions;
+
+  /**
+   * A list of remote data objects of communities' collections
+   */
+  subCollectionsRDObs: BehaviorSubject<RemoteData<PaginatedList<Collection>>> = new BehaviorSubject<RemoteData<PaginatedList<Collection>>>({} as any);
+
+  constructor(private cds: CollectionDataService) {}

  ngOnInit(): void {
-    this.subCollectionsRDObs = this.community.collections;
+    this.config = new PaginationComponentOptions();
+    this.config.id = this.pageId;
+    this.config.pageSize = 5;
+    this.config.currentPage = 1;
+    this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
+    this.updatePage();
+  }
+
+  /**
+   * Called when one of the pagination settings is changed
+   * @param event The new pagination data
+   */
+  onPaginationChange(event) {
+    this.config.currentPage = event.pagination.currentPage;
+    this.config.pageSize = event.pagination.pageSize;
+    this.sortConfig.field = event.sort.field;
+    this.sortConfig.direction = event.sort.direction;
+    this.updatePage();
+  }
+
+  /**
+   * Update the list of collections
+   */
+  updatePage() {
+    this.cds.findByParent(this.community.id,{
+      currentPage: this.config.currentPage,
+      elementsPerPage: this.config.pageSize,
+      sort: { field: this.sortConfig.field, direction: this.sortConfig.direction }
+    }).pipe(take(1)).subscribe((results) => {
+      this.subCollectionsRDObs.next(results);
+    });
  }
 }
--- a/src/app/+community-page/sub-community-list/community-page-sub-community-list.component.html
+++ b/src/app/+community-page/sub-community-list/community-page-sub-community-list.component.html
@@ -1,14 +1,13 @@
 <ng-container *ngVar="(subCommunitiesRDObs | async) as subCommunitiesRD">
  <div *ngIf="subCommunitiesRD?.hasSucceeded && subCommunitiesRD?.payload.totalElements > 0" @fadeIn>
    <h2>{{'community.sub-community-list.head' | translate}}</h2>
-    <ul>
-      <li *ngFor="let community of subCommunitiesRD?.payload.page">
-        <p>
-          <span class="lead"><a [routerLink]="['/communities', community.id]">{{community.name}}</a></span><br>
-          <span class="text-muted">{{community.shortDescription}}</span>
-        </p>
-      </li>
-    </ul>
+    <ds-viewable-collection
+      [config]="config"
+      [sortConfig]="sortConfig"
+      [objects]="subCommunitiesRD"
+      [hideGear]="false"
+      (paginationChange)="onPaginationChange($event)">
+    </ds-viewable-collection>
  </div>
  <ds-error *ngIf="subCommunitiesRD?.hasFailed" message="{{'error.sub-communities' | translate}}"></ds-error>
  <ds-loading *ngIf="subCommunitiesRD?.isLoading" message="{{'loading.sub-communities' | translate}}"></ds-loading>
--- a/src/app/+community-page/sub-community-list/community-page-sub-community-list.component.spec.ts
+++ b/src/app/+community-page/sub-community-list/community-page-sub-community-list.component.spec.ts
@@ -1,21 +1,29 @@
-import {async, ComponentFixture, TestBed} from '@angular/core/testing';
-import {TranslateModule} from '@ngx-translate/core';
-import {NO_ERRORS_SCHEMA} from '@angular/core';
-import {CommunityPageSubCommunityListComponent} from './community-page-sub-community-list.component';
-import {Community} from '../../core/shared/community.model';
-import {RemoteData} from '../../core/data/remote-data';
-import {PaginatedList} from '../../core/data/paginated-list';
-import {PageInfo} from '../../core/shared/page-info.model';
-import {SharedModule} from '../../shared/shared.module';
-import {RouterTestingModule} from '@angular/router/testing';
-import {NoopAnimationsModule} from '@angular/platform-browser/animations';
-import {By} from '@angular/platform-browser';
-import {of as observableOf,  Observable } from 'rxjs';
-import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+import { By } from '@angular/platform-browser';

-describe('SubCommunityList Component', () => {
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+import { CommunityPageSubCommunityListComponent } from './community-page-sub-community-list.component';
+import { Community } from '../../core/shared/community.model';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { SharedModule } from '../../shared/shared.module';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { FindListOptions } from '../../core/data/request.models';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { CommunityDataService } from '../../core/data/community-data.service';
+import { SelectableListService } from '../../shared/object-list/selectable-list/selectable-list.service';
+
+describe('CommunityPageSubCommunityListComponent Component', () => {
  let comp: CommunityPageSubCommunityListComponent;
  let fixture: ComponentFixture<CommunityPageSubCommunityListComponent>;
+  let communityDataServiceStub: any;
+  let subCommList = [];

  const subcommunities = [Object.assign(new Community(), {
    id: '123456789-1',
@@ -32,34 +40,92 @@ describe('SubCommunityList Component', () => {
          { language: 'en_US', value: 'SubCommunity 2' }
        ]
      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '12345678942',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'SubCommunity 7' }
+        ]
+      }
    })
  ];

-  const emptySubCommunitiesCommunity = Object.assign(new Community(), {
+  const mockCommunity = Object.assign(new Community(), {
+    id: '123456789',
    metadata: {
      'dc.title': [
        { language: 'en_US', value: 'Test title' }
      ]
-    },
-    subcommunities: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), []))
+    }
  });

-  const mockCommunity = Object.assign(new Community(), {
-      metadata: {
-        'dc.title': [
-          { language: 'en_US', value: 'Test title' }
-        ]
-      },
-      subcommunities: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subcommunities))
-    })
-  ;
+  communityDataServiceStub = {
+    findByParent(parentUUID: string, options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > subCommList.length) {
+        endPageIndex = subCommList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), subCommList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };

  beforeEach(async(() => {
    TestBed.configureTestingModule({
-      imports: [TranslateModule.forRoot(), SharedModule,
+      imports: [
+        TranslateModule.forRoot(),
+        SharedModule,
        RouterTestingModule.withRoutes([]),
-        NoopAnimationsModule],
+        NgbModule.forRoot(),
+        NoopAnimationsModule
+      ],
      declarations: [CommunityPageSubCommunityListComponent],
+      providers: [
+        { provide: CommunityDataService, useValue: communityDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+        { provide: SelectableListService, useValue: {} },
+      ],
      schemas: [NO_ERRORS_SCHEMA]
    }).compileComponents();
  }));
@@ -67,23 +133,52 @@ describe('SubCommunityList Component', () => {
  beforeEach(() => {
    fixture = TestBed.createComponent(CommunityPageSubCommunityListComponent);
    comp = fixture.componentInstance;
+    comp.community = mockCommunity;
+
  });

-  it('should display a list of subCommunities', () => {
-    comp.community = mockCommunity;
+  it('should display a list of sub-communities', () => {
+    subCommList = subcommunities;
    fixture.detectChanges();

    const subComList = fixture.debugElement.queryAll(By.css('li'));
-    expect(subComList.length).toEqual(2);
+    expect(subComList.length).toEqual(5);
    expect(subComList[0].nativeElement.textContent).toContain('SubCommunity 1');
    expect(subComList[1].nativeElement.textContent).toContain('SubCommunity 2');
+    expect(subComList[2].nativeElement.textContent).toContain('SubCommunity 3');
+    expect(subComList[3].nativeElement.textContent).toContain('SubCommunity 4');
+    expect(subComList[4].nativeElement.textContent).toContain('SubCommunity 5');
  });

-  it('should not display the header when subCommunities are empty', () => {
-    comp.community = emptySubCommunitiesCommunity;
+  it('should not display the header when list of sub-communities is empty', () => {
+    subCommList = [];
    fixture.detectChanges();

    const subComHead = fixture.debugElement.queryAll(By.css('h2'));
    expect(subComHead.length).toEqual(0);
  });
+
+  it('should update list of sub-communities on pagination change', () => {
+    subCommList = subcommunities;
+    fixture.detectChanges();
+
+    const pagination = Object.create({
+      pagination:{
+        id: comp.pageId,
+        currentPage: 2,
+        pageSize: 5
+      },
+      sort: {
+        field: 'dc.title',
+        direction: 'ASC'
+      }
+    });
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('SubCommunity 6');
+    expect(collList[1].nativeElement.textContent).toContain('SubCommunity 7');
+  });
 });
--- a/src/app/+community-page/sub-community-list/community-page-sub-community-list.component.ts
+++ b/src/app/+community-page/sub-community-list/community-page-sub-community-list.component.ts
@@ -1,26 +1,82 @@
 import { Component, Input, OnInit } from '@angular/core';

+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
+
 import { RemoteData } from '../../core/data/remote-data';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeIn } from '../../shared/animations/fade';
 import { PaginatedList } from '../../core/data/paginated-list';
-import {Observable} from 'rxjs';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
+import { CommunityDataService } from '../../core/data/community-data.service';

@Component({
  selector: 'ds-community-page-sub-community-list',
  styleUrls: ['./community-page-sub-community-list.component.scss'],
  templateUrl: './community-page-sub-community-list.component.html',
-  animations:[fadeIn]
+  animations: [fadeIn]
 })
 /**
 * Component to render the sub-communities of a Community
 */
 export class CommunityPageSubCommunityListComponent implements OnInit {
  @Input() community: Community;
-  subCommunitiesRDObs: Observable<RemoteData<PaginatedList<Community>>>;
+
+  /**
+   * The pagination configuration
+   */
+  config: PaginationComponentOptions;
+
+  /**
+   * The pagination id
+   */
+  pageId = 'community-subCommunities-pagination';
+
+  /**
+   * The sorting configuration
+   */
+  sortConfig: SortOptions;
+
+  /**
+   * A list of remote data objects of communities' collections
+   */
+  subCommunitiesRDObs: BehaviorSubject<RemoteData<PaginatedList<Community>>> = new BehaviorSubject<RemoteData<PaginatedList<Community>>>({} as any);
+
+  constructor(private cds: CommunityDataService) {
+  }

  ngOnInit(): void {
-    this.subCommunitiesRDObs = this.community.subcommunities;
+    this.config = new PaginationComponentOptions();
+    this.config.id = this.pageId;
+    this.config.pageSize = 5;
+    this.config.currentPage = 1;
+    this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
+    this.updatePage();
+  }
+
+  /**
+   * Called when one of the pagination settings is changed
+   * @param event The new pagination data
+   */
+  onPaginationChange(event) {
+    this.config.currentPage = event.pagination.currentPage;
+    this.config.pageSize = event.pagination.pageSize;
+    this.sortConfig.field = event.sort.field;
+    this.sortConfig.direction = event.sort.direction;
+    this.updatePage();
+  }
+
+  /**
+   * Update the list of sub-communities
+   */
+  updatePage() {
+    this.cds.findByParent(this.community.id, {
+      currentPage: this.config.currentPage,
+      elementsPerPage: this.config.pageSize,
+      sort: { field: this.sortConfig.field, direction: this.sortConfig.direction }
+    }).pipe(take(1)).subscribe((results) => {
+      this.subCommunitiesRDObs.next(results);
+    });
  }
 }
--- a/src/app/+home-page/top-level-community-list/top-level-community-list.component.spec.ts
+++ b/src/app/+home-page/top-level-community-list/top-level-community-list.component.spec.ts
@@ -0,0 +1,161 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NoopAnimationsModule } from '@angular/platform-browser/animations';
+import { By } from '@angular/platform-browser';
+
+import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+
+import { TopLevelCommunityListComponent } from './top-level-community-list.component';
+import { Community } from '../../core/shared/community.model';
+import { PaginatedList } from '../../core/data/paginated-list';
+import { PageInfo } from '../../core/shared/page-info.model';
+import { SharedModule } from '../../shared/shared.module';
+import { createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { FindListOptions } from '../../core/data/request.models';
+import { HostWindowService } from '../../shared/host-window.service';
+import { HostWindowServiceStub } from '../../shared/testing/host-window-service-stub';
+import { CommunityDataService } from '../../core/data/community-data.service';
+import { SelectableListService } from '../../shared/object-list/selectable-list/selectable-list.service';
+
+describe('TopLevelCommunityList Component', () => {
+  let comp: TopLevelCommunityListComponent;
+  let fixture: ComponentFixture<TopLevelCommunityListComponent>;
+  let communityDataServiceStub: any;
+
+  const topCommList = [Object.assign(new Community(), {
+    id: '123456789-1',
+    metadata: {
+      'dc.title': [
+        { language: 'en_US', value: 'TopCommunity 1' }
+      ]
+    }
+  }),
+    Object.assign(new Community(), {
+      id: '123456789-2',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 2' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-3',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 3' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '12345678942',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 4' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-5',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 5' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-6',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 6' }
+        ]
+      }
+    }),
+    Object.assign(new Community(), {
+      id: '123456789-7',
+      metadata: {
+        'dc.title': [
+          { language: 'en_US', value: 'TopCommunity 7' }
+        ]
+      }
+    })
+  ];
+
+  communityDataServiceStub = {
+    findTop(options: FindListOptions = {}) {
+      let currentPage = options.currentPage;
+      let elementsPerPage = options.elementsPerPage;
+      if (currentPage === undefined) {
+        currentPage = 1
+      }
+      elementsPerPage = 5;
+
+      const startPageIndex = (currentPage - 1) * elementsPerPage;
+      let endPageIndex = (currentPage * elementsPerPage);
+      if (endPageIndex > topCommList.length) {
+        endPageIndex = topCommList.length;
+      }
+      return createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo(), topCommList.slice(startPageIndex, endPageIndex)));
+
+    }
+  };
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        TranslateModule.forRoot(),
+        SharedModule,
+        RouterTestingModule.withRoutes([]),
+        NgbModule.forRoot(),
+        NoopAnimationsModule
+      ],
+      declarations: [TopLevelCommunityListComponent],
+      providers: [
+        { provide: CommunityDataService, useValue: communityDataServiceStub },
+        { provide: HostWindowService, useValue: new HostWindowServiceStub(0) },
+        { provide: SelectableListService, useValue: {} },
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(TopLevelCommunityListComponent);
+    comp = fixture.componentInstance;
+    fixture.detectChanges();
+
+  });
+
+  it('should display a list of top-communities', () => {
+    const subComList = fixture.debugElement.queryAll(By.css('li'));
+
+    expect(subComList.length).toEqual(5);
+    expect(subComList[0].nativeElement.textContent).toContain('TopCommunity 1');
+    expect(subComList[1].nativeElement.textContent).toContain('TopCommunity 2');
+    expect(subComList[2].nativeElement.textContent).toContain('TopCommunity 3');
+    expect(subComList[3].nativeElement.textContent).toContain('TopCommunity 4');
+    expect(subComList[4].nativeElement.textContent).toContain('TopCommunity 5');
+  });
+
+  it('should update list of top-communities on pagination change', () => {
+    const pagination = Object.create({
+      pagination:{
+        id: comp.pageId,
+        currentPage: 2,
+        pageSize: 5
+      },
+      sort: {
+        field: 'dc.title',
+        direction: 'ASC'
+      }
+    });
+    comp.onPaginationChange(pagination);
+    fixture.detectChanges();
+
+    const collList = fixture.debugElement.queryAll(By.css('li'));
+    expect(collList.length).toEqual(2);
+    expect(collList[0].nativeElement.textContent).toContain('TopCommunity 6');
+    expect(collList[1].nativeElement.textContent).toContain('TopCommunity 7');
+  });
+});
--- a/src/app/+home-page/top-level-community-list/top-level-community-list.component.ts
+++ b/src/app/+home-page/top-level-community-list/top-level-community-list.component.ts
@@ -1,15 +1,15 @@
 import { ChangeDetectionStrategy, Component, OnInit } from '@angular/core';
-import { BehaviorSubject, Observable } from 'rxjs';
+
+import { BehaviorSubject } from 'rxjs';
+import { take } from 'rxjs/operators';
+
 import { SortDirection, SortOptions } from '../../core/cache/models/sort-options.model';
 import { CommunityDataService } from '../../core/data/community-data.service';
 import { PaginatedList } from '../../core/data/paginated-list';
-
 import { RemoteData } from '../../core/data/remote-data';
 import { Community } from '../../core/shared/community.model';
-
 import { fadeInOut } from '../../shared/animations/fade';
 import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
-import { take } from 'rxjs/operators';

 /**
 * this component renders the Top-Level Community list
@@ -33,6 +33,11 @@ export class TopLevelCommunityListComponent implements OnInit {
   */
  config: PaginationComponentOptions;

+  /**
+   * The pagination id
+   */
+  pageId = 'top-level-pagination';
+
  /**
   * The sorting configuration
   */
@@ -40,7 +45,7 @@ export class TopLevelCommunityListComponent implements OnInit {

  constructor(private cds: CommunityDataService) {
    this.config = new PaginationComponentOptions();
-    this.config.id = 'top-level-pagination';
+    this.config.id = this.pageId;
    this.config.pageSize = 5;
    this.config.currentPage = 1;
    this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
@@ -55,10 +60,10 @@ export class TopLevelCommunityListComponent implements OnInit {
   * @param event The new pagination data
   */
  onPaginationChange(event) {
-    this.config.currentPage = event.page;
-    this.config.pageSize = event.pageSize;
-    this.sortConfig.field = event.sortField;
-    this.sortConfig.direction = event.sortDirection;
+    this.config.currentPage = event.pagination.currentPage;
+    this.config.pageSize = event.pagination.pageSize;
+    this.sortConfig.field = event.sort.field;
+    this.sortConfig.direction = event.sort.direction;
    this.updatePage();
  }

--- a/src/app/+search-page/configuration-search-page.component.ts
+++ b/src/app/+search-page/configuration-search-page.component.ts
@@ -5,10 +5,10 @@ import { ChangeDetectionStrategy, Component, Inject, Input, OnInit } from '@angu
 import { pushInOut } from '../shared/animations/push';
 import { SEARCH_CONFIG_SERVICE } from '../+my-dspace-page/my-dspace-page.component';
 import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';
-import { Router } from '@angular/router';
 import { hasValue } from '../shared/empty.util';
 import { RouteService } from '../core/services/route.service';
 import { SearchService } from '../core/shared/search/search.service';
+import { Router } from '@angular/router';

 /**
 * This component renders a search page using a configuration as input.
@@ -61,5 +61,8 @@ export class ConfigurationSearchPageComponent extends SearchComponent implements
    if (hasValue(this.configuration)) {
      this.routeService.setParameter('configuration', this.configuration);
    }
+    if (hasValue(this.fixedFilterQuery)) {
+      this.routeService.setParameter('fixedFilter', this.fixedFilterQuery);
+    }
  }
 }
--- a/src/app/+search-page/search-page.module.ts
+++ b/src/app/+search-page/search-page.module.ts
@@ -3,19 +3,23 @@ import { CommonModule } from '@angular/common';
 import { CoreModule } from '../core/core.module';
 import { SharedModule } from '../shared/shared.module';
 import { SearchPageRoutingModule } from './search-page-routing.module';
-import { SearchPageComponent } from './search-page.component';
+import { SearchComponent } from './search.component';
+import { SidebarService } from '../shared/sidebar/sidebar.service';
+import { EffectsModule } from '@ngrx/effects';
 import { ConfigurationSearchPageComponent } from './configuration-search-page.component';
 import { ConfigurationSearchPageGuard } from './configuration-search-page.guard';
-import { SearchComponent } from './search.component';
 import { SearchTrackerComponent } from './search-tracker.component';
 import { StatisticsModule } from '../statistics/statistics.module';
+import { SearchPageComponent } from './search-page.component';
+import { SidebarFilterService } from '../shared/sidebar/filter/sidebar-filter.service';
+import { SearchFilterService } from '../core/shared/search/search-filter.service';
+import { SearchConfigurationService } from '../core/shared/search/search-configuration.service';

 const components = [
  SearchPageComponent,
  SearchComponent,
  ConfigurationSearchPageComponent,
-  SearchTrackerComponent,
-
+  SearchTrackerComponent
 ];

@NgModule({
@@ -26,8 +30,14 @@ const components = [
    CoreModule.forRoot(),
    StatisticsModule.forRoot(),
  ],
-  providers: [ConfigurationSearchPageGuard],
  declarations: components,
+  providers: [
+    SidebarService,
+    SidebarFilterService,
+    SearchFilterService,
+    ConfigurationSearchPageGuard,
+    SearchConfigurationService
+  ],
  exports: components
 })

--- a/src/app/core/cache/models/normalized-external-source-entry.model.ts
+++ b/src/app/core/cache/models/normalized-external-source-entry.model.ts
@@ -0,0 +1,36 @@
+import { autoserialize, autoserializeAs, inheritSerialization } from 'cerialize';
+import { NormalizedObject } from './normalized-object.model';
+import { ExternalSourceEntry } from '../../shared/external-source-entry.model';
+import { mapsTo } from '../builders/build-decorators';
+import { MetadataMap, MetadataMapSerializer } from '../../shared/metadata.models';
+
+/**
+ * Normalized model class for an external source entry
+ */
+@mapsTo(ExternalSourceEntry)
+@inheritSerialization(NormalizedObject)
+export class NormalizedExternalSourceEntry extends NormalizedObject<ExternalSourceEntry> {
+  /**
+   * Unique identifier
+   */
+  @autoserialize
+  id: string;
+
+  /**
+   * The value to display
+   */
+  @autoserialize
+  display: string;
+
+  /**
+   * The value to store the entry with
+   */
+  @autoserialize
+  value: string;
+
+  /**
+   * Metadata of the entry
+   */
+  @autoserializeAs(MetadataMapSerializer)
+  metadata: MetadataMap;
+}
--- a/src/app/core/cache/models/normalized-external-source.model.ts
+++ b/src/app/core/cache/models/normalized-external-source.model.ts
@@ -0,0 +1,29 @@
+import { autoserialize, inheritSerialization } from 'cerialize';
+import { NormalizedObject } from './normalized-object.model';
+import { ExternalSource } from '../../shared/external-source.model';
+import { mapsTo } from '../builders/build-decorators';
+
+/**
+ * Normalized model class for an external source
+ */
+@mapsTo(ExternalSource)
+@inheritSerialization(NormalizedObject)
+export class NormalizedExternalSource extends NormalizedObject<ExternalSource> {
+  /**
+   * Unique identifier
+   */
+  @autoserialize
+  id: string;
+
+  /**
+   * The name of this external source
+   */
+  @autoserialize
+  name: string;
+
+  /**
+   * Is the source hierarchical?
+   */
+  @autoserialize
+  hierarchical: boolean;
+}
--- a/src/app/core/core.module.ts
+++ b/src/app/core/core.module.ts
@@ -136,6 +136,10 @@ import { SearchConfigurationService } from './shared/search/search-configuration
 import { SelectableListService } from '../shared/object-list/selectable-list/selectable-list.service';
 import { RelationshipTypeService } from './data/relationship-type.service';
 import { SidebarService } from '../shared/sidebar/sidebar.service';
+import { NormalizedExternalSource } from './cache/models/normalized-external-source.model';
+import { NormalizedExternalSourceEntry } from './cache/models/normalized-external-source-entry.model';
+import { ExternalSourceService } from './data/external-source.service';
+import { LookupRelationService } from './data/lookup-relation.service';

 /**
 * When not in production, endpoint responses can be mocked for testing purposes
@@ -247,6 +251,8 @@ const PROVIDERS = [
  SearchConfigurationService,
  SelectableListService,
  RelationshipTypeService,
+  ExternalSourceService,
+  LookupRelationService,
  // register AuthInterceptor as HttpInterceptor
  {
    provide: HTTP_INTERCEPTORS,
@@ -292,7 +298,9 @@ export const normalizedModels =
    NormalizedPoolTask,
    NormalizedRelationship,
    NormalizedRelationshipType,
-    NormalizedItemType
+    NormalizedItemType,
+    NormalizedExternalSource,
+    NormalizedExternalSourceEntry
  ];

@NgModule({
--- a/src/app/core/data/external-source.service.spec.ts
+++ b/src/app/core/data/external-source.service.spec.ts
@@ -0,0 +1,76 @@
+import { ExternalSourceService } from './external-source.service';
+import { createPaginatedList, createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { ExternalSourceEntry } from '../shared/external-source-entry.model';
+import { of as observableOf } from 'rxjs';
+import { GetRequest } from './request.models';
+
+describe('ExternalSourceService', () => {
+  let service: ExternalSourceService;
+
+  let requestService;
+  let rdbService;
+  let halService;
+
+  const entries = [
+    Object.assign(new ExternalSourceEntry(), {
+      id: '0001-0001-0001-0001',
+      display: 'John Doe',
+      value: 'John, Doe',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0001'
+          }
+        ]
+      }
+    }),
+    Object.assign(new ExternalSourceEntry(), {
+      id: '0001-0001-0001-0002',
+      display: 'Sampson Megan',
+      value: 'Sampson, Megan',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0002'
+          }
+        ]
+      }
+    })
+  ];
+
+  function init() {
+    requestService = jasmine.createSpyObj('requestService', {
+      generateRequestId: 'request-uuid',
+      configure: {}
+    });
+    rdbService = jasmine.createSpyObj('rdbService', {
+      buildList: createSuccessfulRemoteDataObject$(createPaginatedList(entries))
+    });
+    halService = jasmine.createSpyObj('halService', {
+      getEndpoint: observableOf('external-sources-REST-endpoint')
+    });
+    service = new ExternalSourceService(requestService, rdbService, undefined, undefined, undefined, halService, undefined, undefined, undefined);
+  }
+
+  beforeEach(() => {
+    init();
+  });
+
+  describe('getExternalSourceEntries', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getExternalSourceEntries('test');
+    });
+
+    it('should configure a GetRequest', () => {
+      expect(requestService.configure).toHaveBeenCalledWith(jasmine.any(GetRequest));
+    });
+
+    it('should return the entries', () => {
+      result.subscribe((resultRD) => {
+        expect(resultRD.payload.page).toBe(entries);
+      });
+    });
+  });
+});
--- a/src/app/core/data/external-source.service.ts
+++ b/src/app/core/data/external-source.service.ts
@@ -0,0 +1,85 @@
+import { Injectable } from '@angular/core';
+import { DataService } from './data.service';
+import { ExternalSource } from '../shared/external-source.model';
+import { RequestService } from './request.service';
+import { RemoteDataBuildService } from '../cache/builders/remote-data-build.service';
+import { NormalizedObjectBuildService } from '../cache/builders/normalized-object-build.service';
+import { Store } from '@ngrx/store';
+import { CoreState } from '../core.reducers';
+import { ObjectCacheService } from '../cache/object-cache.service';
+import { HALEndpointService } from '../shared/hal-endpoint.service';
+import { NotificationsService } from '../../shared/notifications/notifications.service';
+import { HttpClient } from '@angular/common/http';
+import { FindListOptions, GetRequest } from './request.models';
+import { Observable } from 'rxjs/internal/Observable';
+import { distinctUntilChanged, map, switchMap } from 'rxjs/operators';
+import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
+import { hasValue, isNotEmptyOperator } from '../../shared/empty.util';
+import { configureRequest } from '../shared/operators';
+import { RemoteData } from './remote-data';
+import { PaginatedList } from './paginated-list';
+import { ExternalSourceEntry } from '../shared/external-source-entry.model';
+import { DefaultChangeAnalyzer } from './default-change-analyzer.service';
+
+/**
+ * A service handling all external source requests
+ */
+@Injectable()
+export class ExternalSourceService extends DataService<ExternalSource> {
+  protected linkPath = 'externalsources';
+
+  constructor(
+    protected requestService: RequestService,
+    protected rdbService: RemoteDataBuildService,
+    protected dataBuildService: NormalizedObjectBuildService,
+    protected store: Store<CoreState>,
+    protected objectCache: ObjectCacheService,
+    protected halService: HALEndpointService,
+    protected notificationsService: NotificationsService,
+    protected http: HttpClient,
+    protected comparator: DefaultChangeAnalyzer<ExternalSource>) {
+    super();
+  }
+
+  /**
+   * Get the endpoint to browse external sources
+   * @param options
+   * @param linkPath
+   */
+  getBrowseEndpoint(options: FindListOptions = {}, linkPath: string = this.linkPath): Observable<string> {
+    return this.halService.getEndpoint(linkPath);
+  }
+
+  /**
+   * Get the endpoint for an external source's entries
+   * @param externalSourceId  The id of the external source to fetch entries for
+   */
+  getEntriesEndpoint(externalSourceId: string): Observable<string> {
+    return this.getBrowseEndpoint().pipe(
+      map((href) => this.getIDHref(href, externalSourceId)),
+      switchMap((href) => this.halService.getEndpoint('entries', href))
+    );
+  }
+
+  /**
+   * Get the entries for an external source
+   * @param externalSourceId  The id of the external source to fetch entries for
+   * @param searchOptions     The search options to limit results to
+   */
+  getExternalSourceEntries(externalSourceId: string, searchOptions?: PaginatedSearchOptions): Observable<RemoteData<PaginatedList<ExternalSourceEntry>>> {
+    const requestUuid = this.requestService.generateRequestId();
+
+    const href$ = this.getEntriesEndpoint(externalSourceId).pipe(
+      isNotEmptyOperator(),
+      distinctUntilChanged(),
+      map((endpoint: string) => hasValue(searchOptions) ? searchOptions.toRestUrl(endpoint) : endpoint)
+    );
+
+    href$.pipe(
+      map((endpoint: string) => new GetRequest(requestUuid, endpoint)),
+      configureRequest(this.requestService)
+    ).subscribe();
+
+    return this.rdbService.buildList(href$);
+  }
+}
--- a/src/app/core/data/lookup-relation.service.spec.ts
+++ b/src/app/core/data/lookup-relation.service.spec.ts
@@ -0,0 +1,116 @@
+import { LookupRelationService } from './lookup-relation.service';
+import { ExternalSourceService } from './external-source.service';
+import { SearchService } from '../shared/search/search.service';
+import { createPaginatedList, createSuccessfulRemoteDataObject$ } from '../../shared/testing/utils';
+import { PaginatedList } from './paginated-list';
+import { PageInfo } from '../shared/page-info.model';
+import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
+import { RelationshipOptions } from '../../shared/form/builder/models/relationship-options.model';
+import { SearchResult } from '../../shared/search/search-result.model';
+import { Item } from '../shared/item.model';
+import { skip, take } from 'rxjs/operators';
+import { ExternalSource } from '../shared/external-source.model';
+
+describe('LookupRelationService', () => {
+  let service: LookupRelationService;
+  let externalSourceService: ExternalSourceService;
+  let searchService: SearchService;
+
+  const totalExternal = 8;
+  const optionsWithQuery = new PaginatedSearchOptions({ query: 'test-query' });
+  const relationship = Object.assign(new RelationshipOptions(), {
+    filter: 'test-filter',
+    configuration: 'test-configuration'
+  });
+  const localResults = [
+    Object.assign(new SearchResult(), {
+      indexableObject: Object.assign(new Item(), {
+        uuid: 'test-item-uuid',
+        handle: 'test-item-handle'
+      })
+    })
+  ];
+  const externalSource = Object.assign(new ExternalSource(), {
+    id: 'orcidV2',
+    name: 'orcidV2',
+    hierarchical: false
+  });
+
+  function init() {
+    externalSourceService = jasmine.createSpyObj('externalSourceService', {
+      getExternalSourceEntries: createSuccessfulRemoteDataObject$(new PaginatedList(new PageInfo({ elementsPerPage: 1, totalElements: totalExternal, totalPages: totalExternal, currentPage: 1 }), [{}]))
+    });
+    searchService = jasmine.createSpyObj('searchService', {
+      search: createSuccessfulRemoteDataObject$(createPaginatedList(localResults))
+    });
+    service = new LookupRelationService(externalSourceService, searchService);
+  }
+
+  beforeEach(() => {
+    init();
+  });
+
+  describe('getLocalResults', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getLocalResults(relationship, optionsWithQuery);
+    });
+
+    it('should return the local results', () => {
+      result.subscribe((resultsRD) => {
+        expect(resultsRD.payload.page).toBe(localResults);
+      });
+    });
+
+    it('should set the searchConfig to contain a fixedFilter and configuration', () => {
+      expect(service.searchConfig).toEqual(Object.assign(new PaginatedSearchOptions({}), optionsWithQuery,
+        { fixedFilter: relationship.filter, configuration: relationship.searchConfiguration }
+      ));
+    });
+  });
+
+  describe('getTotalLocalResults', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getTotalLocalResults(relationship, optionsWithQuery);
+    });
+
+    it('should start with 0', () => {
+      result.pipe(take(1)).subscribe((amount) => {
+        expect(amount).toEqual(0)
+      });
+    });
+
+    it('should return the correct total amount', () => {
+      result.pipe(skip(1)).subscribe((amount) => {
+        expect(amount).toEqual(localResults.length)
+      });
+    });
+
+    it('should not set searchConfig', () => {
+      expect(service.searchConfig).toBeUndefined();
+    });
+  });
+
+  describe('getTotalExternalResults', () => {
+    let result;
+
+    beforeEach(() => {
+      result = service.getTotalExternalResults(externalSource, optionsWithQuery);
+    });
+
+    it('should start with 0', () => {
+      result.pipe(take(1)).subscribe((amount) => {
+        expect(amount).toEqual(0)
+      });
+    });
+
+    it('should return the correct total amount', () => {
+      result.pipe(skip(1)).subscribe((amount) => {
+        expect(amount).toEqual(totalExternal)
+      });
+    });
+  });
+});
--- a/src/app/core/data/lookup-relation.service.ts
+++ b/src/app/core/data/lookup-relation.service.ts
@@ -0,0 +1,94 @@
+import { ExternalSourceService } from './external-source.service';
+import { SearchService } from '../shared/search/search.service';
+import { concat, map, multicast, startWith, take, takeWhile } from 'rxjs/operators';
+import { PaginatedSearchOptions } from '../../shared/search/paginated-search-options.model';
+import { ReplaySubject } from 'rxjs/internal/ReplaySubject';
+import { RemoteData } from './remote-data';
+import { PaginatedList } from './paginated-list';
+import { SearchResult } from '../../shared/search/search-result.model';
+import { DSpaceObject } from '../shared/dspace-object.model';
+import { RelationshipOptions } from '../../shared/form/builder/models/relationship-options.model';
+import { Observable } from 'rxjs/internal/Observable';
+import { Item } from '../shared/item.model';
+import { PaginationComponentOptions } from '../../shared/pagination/pagination-component-options.model';
+import { getAllSucceededRemoteData, getRemoteDataPayload } from '../shared/operators';
+import { Injectable } from '@angular/core';
+import { ExternalSource } from '../shared/external-source.model';
+import { ExternalSourceEntry } from '../shared/external-source-entry.model';
+
+/**
+ * A service for retrieving local and external entries information during a relation lookup
+ */
+@Injectable()
+export class LookupRelationService {
+  /**
+   * The search config last used for retrieving local results
+   */
+  public searchConfig: PaginatedSearchOptions;
+
+  /**
+   * Pagination options for retrieving exactly one result
+   */
+  private singleResultOptions = Object.assign(new PaginationComponentOptions(), {
+    id: 'single-result-options',
+    pageSize: 1
+  });
+
+  constructor(protected externalSourceService: ExternalSourceService,
+              protected searchService: SearchService) {
+  }
+
+  /**
+   * Retrieve the available local entries for a relationship
+   * @param relationship    Relationship options
+   * @param searchOptions   Search options to filter results
+   * @param setSearchConfig Optionally choose if we should store the used search config in a local variable (defaults to true)
+   */
+  getLocalResults(relationship: RelationshipOptions, searchOptions: PaginatedSearchOptions, setSearchConfig = true): Observable<RemoteData<PaginatedList<SearchResult<Item>>>> {
+    const newConfig = Object.assign(new PaginatedSearchOptions({}), searchOptions,
+      { fixedFilter: relationship.filter, configuration: relationship.searchConfiguration }
+    );
+    if (setSearchConfig) {
+      this.searchConfig = newConfig;
+    }
+    return this.searchService.search(newConfig).pipe(
+      /* Make sure to only listen to the first x results, until loading is finished */
+      /* TODO: in Rxjs 6.4.0 and up, we can replace this with takeWhile(predicate, true) - see https://stackoverflow.com/a/44644237 */
+      multicast(
+        () => new ReplaySubject(1),
+        (subject) => subject.pipe(
+          takeWhile((rd: RemoteData<PaginatedList<SearchResult<DSpaceObject>>>) => rd.isLoading),
+          concat(subject.pipe(take(1)))
+        )
+      ) as any
+    ) as Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
+  }
+
+  /**
+   * Calculate the total local entries available for the given relationship
+   * @param relationship  Relationship options
+   * @param searchOptions Search options to filter results
+   */
+  getTotalLocalResults(relationship: RelationshipOptions, searchOptions: PaginatedSearchOptions): Observable<number> {
+    return this.getLocalResults(relationship, Object.assign(new PaginatedSearchOptions({}), searchOptions, { pagination: this.singleResultOptions }), false).pipe(
+      getAllSucceededRemoteData(),
+      getRemoteDataPayload(),
+      map((results: PaginatedList<SearchResult<Item>>) => results.totalElements),
+      startWith(0)
+    );
+  }
+
+  /**
+   * Calculate the total external entries available for a given external source
+   * @param externalSource  External Source
+   * @param searchOptions   Search options to filter results
+   */
+  getTotalExternalResults(externalSource: ExternalSource, searchOptions: PaginatedSearchOptions): Observable<number> {
+    return this.externalSourceService.getExternalSourceEntries(externalSource.id, Object.assign(new PaginatedSearchOptions({}), searchOptions, { pagination: this.singleResultOptions })).pipe(
+      getAllSucceededRemoteData(),
+      getRemoteDataPayload(),
+      map((results: PaginatedList<ExternalSourceEntry>) => results.totalElements),
+      startWith(0)
+    );
+  }
+}
--- a/src/app/core/services/route.service.ts
+++ b/src/app/core/services/route.service.ts
@@ -176,10 +176,20 @@ export class RouteService {
    );
  }

+  /**
+   * Add a parameter to the current route
+   * @param key   The parameter name
+   * @param value The parameter value
+   */
  public addParameter(key, value) {
    this.store.dispatch(new AddParameterAction(key, value));
  }

+  /**
+   * Set a parameter in the current route (overriding the previous value)
+   * @param key   The parameter name
+   * @param value The parameter value
+   */
  public setParameter(key, value) {
    this.store.dispatch(new SetParameterAction(key, value));
  }
--- a/src/app/core/shared/external-source-entry.model.ts
+++ b/src/app/core/shared/external-source-entry.model.ts
@@ -0,0 +1,43 @@
+import { MetadataMap } from './metadata.models';
+import { ResourceType } from './resource-type';
+import { ListableObject } from '../../shared/object-collection/shared/listable-object.model';
+import { GenericConstructor } from './generic-constructor';
+
+/**
+ * Model class for a single entry from an external source
+ */
+export class ExternalSourceEntry extends ListableObject {
+  static type = new ResourceType('externalSourceEntry');
+
+  /**
+   * Unique identifier
+   */
+  id: string;
+
+  /**
+   * The value to display
+   */
+  display: string;
+
+  /**
+   * The value to store the entry with
+   */
+  value: string;
+
+  /**
+   * Metadata of the entry
+   */
+  metadata: MetadataMap;
+
+  /**
+   * The link to the rest endpoint where this External Source Entry can be found
+   */
+  self: string;
+
+  /**
+   * Method that returns as which type of object this object should be rendered
+   */
+  getRenderTypes(): Array<string | GenericConstructor<ListableObject>> {
+    return [this.constructor as GenericConstructor<ListableObject>];
+  }
+}
--- a/src/app/core/shared/external-source.model.ts
+++ b/src/app/core/shared/external-source.model.ts
@@ -0,0 +1,29 @@
+import { ResourceType } from './resource-type';
+import { CacheableObject } from '../cache/object-cache.reducer';
+
+/**
+ * Model class for an external source
+ */
+export class ExternalSource extends CacheableObject {
+  static type = new ResourceType('externalsource');
+
+  /**
+   * Unique identifier
+   */
+  id: string;
+
+  /**
+   * The name of this external source
+   */
+  name: string;
+
+  /**
+   * Is the source hierarchical?
+   */
+  hierarchical: boolean;
+
+  /**
+   * The link to the rest endpoint where this External Source can be found
+   */
+  self: string;
+}
--- a/src/app/entity-groups/research-entities/research-entities.module.ts
+++ b/src/app/entity-groups/research-entities/research-entities.module.ts
@@ -25,6 +25,7 @@ import { PersonInputSuggestionsComponent } from './submission/item-list-elements
 import { NameVariantModalComponent } from './submission/name-variant-modal/name-variant-modal.component';
 import { OrgUnitInputSuggestionsComponent } from './submission/item-list-elements/org-unit/org-unit-suggestions/org-unit-input-suggestions.component';
 import { OrgUnitSearchResultListSubmissionElementComponent } from './submission/item-list-elements/org-unit/org-unit-search-result-list-submission-element.component';
+import { ExternalSourceEntryListSubmissionElementComponent } from './submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component';

 const ENTRY_COMPONENTS = [
  OrgUnitComponent,
@@ -48,7 +49,8 @@ const ENTRY_COMPONENTS = [
  PersonInputSuggestionsComponent,
  NameVariantModalComponent,
  OrgUnitSearchResultListSubmissionElementComponent,
-  OrgUnitInputSuggestionsComponent
+  OrgUnitInputSuggestionsComponent,
+  ExternalSourceEntryListSubmissionElementComponent
 ];

@NgModule({
--- a/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.html
+++ b/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.html
@@ -0,0 +1,2 @@
+<div>{{object.display}}</div>
+<div *ngIf="uri"><a target="_blank" [href]="uri.value">{{uri.value}}</a></div>
--- a/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.scss
+++ b/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.scss
--- a/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.spec.ts
+++ b/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.spec.ts
@@ -0,0 +1,47 @@
+import { ExternalSourceEntryListSubmissionElementComponent } from './external-source-entry-list-submission-element.component';
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { ExternalSourceEntry } from '../../../../../core/shared/external-source-entry.model';
+import { TranslateModule } from '@ngx-translate/core';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+
+describe('ExternalSourceEntryListSubmissionElementComponent', () => {
+  let component: ExternalSourceEntryListSubmissionElementComponent;
+  let fixture: ComponentFixture<ExternalSourceEntryListSubmissionElementComponent>;
+
+  const uri = 'https://orcid.org/0001-0001-0001-0001';
+  const entry = Object.assign(new ExternalSourceEntry(), {
+    id: '0001-0001-0001-0001',
+    display: 'John Doe',
+    value: 'John, Doe',
+    metadata: {
+      'dc.identifier.uri': [
+        {
+          value: uri
+        }
+      ]
+    }
+  });
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ExternalSourceEntryListSubmissionElementComponent],
+      imports: [TranslateModule.forRoot()],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ExternalSourceEntryListSubmissionElementComponent);
+    component = fixture.componentInstance;
+    component.object = entry;
+    fixture.detectChanges();
+  });
+
+  it('should display the entry\'s display value', () => {
+    expect(fixture.nativeElement.textContent).toContain(entry.display);
+  });
+
+  it('should display the entry\'s uri', () => {
+    expect(fixture.nativeElement.textContent).toContain(uri);
+  });
+});
--- a/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.ts
+++ b/src/app/entity-groups/research-entities/submission/item-list-elements/external-source-entry/external-source-entry-list-submission-element.component.ts
@@ -0,0 +1,28 @@
+import { AbstractListableElementComponent } from '../../../../../shared/object-collection/shared/object-collection-element/abstract-listable-element.component';
+import { ExternalSourceEntry } from '../../../../../core/shared/external-source-entry.model';
+import { listableObjectComponent } from '../../../../../shared/object-collection/shared/listable-object/listable-object.decorator';
+import { ViewMode } from '../../../../../core/shared/view-mode.model';
+import { Context } from '../../../../../core/shared/context.model';
+import { Component, OnInit } from '@angular/core';
+import { Metadata } from '../../../../../core/shared/metadata.utils';
+import { MetadataValue } from '../../../../../core/shared/metadata.models';
+
+@listableObjectComponent(ExternalSourceEntry, ViewMode.ListElement, Context.SubmissionModal)
+@Component({
+  selector: 'ds-external-source-entry-list-submission-element',
+  styleUrls: ['./external-source-entry-list-submission-element.component.scss'],
+  templateUrl: './external-source-entry-list-submission-element.component.html'
+})
+/**
+ * The component for displaying a list element of an external source entry
+ */
+export class ExternalSourceEntryListSubmissionElementComponent extends AbstractListableElementComponent<ExternalSourceEntry> implements OnInit {
+  /**
+   * The metadata value for the object's uri
+   */
+  uri: MetadataValue;
+
+  ngOnInit(): void {
+    this.uri = Metadata.first(this.object.metadata, 'dc.identifier.uri');
+  }
+}
--- a/src/app/entity-groups/research-entities/submission/name-variant-modal/name-variant-modal.component.ts
+++ b/src/app/entity-groups/research-entities/submission/name-variant-modal/name-variant-modal.component.ts
@@ -10,7 +10,13 @@ import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
  templateUrl: './name-variant-modal.component.html',
  styleUrls: ['./name-variant-modal.component.scss']
 })
+/**
+ * The component for the modal to add a name variant to an item
+ */
 export class NameVariantModalComponent {
+  /**
+   * The name variant
+   */
  @Input() value: string;

  constructor(public modal: NgbActiveModal) {
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/models/disabled/dynamic-disabled.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/models/disabled/dynamic-disabled.component.ts
@@ -11,6 +11,9 @@ import { DynamicDisabledModel } from './dynamic-disabled.model';
  selector: 'ds-dynamic-disabled',
  templateUrl: './dynamic-disabled.component.html'
 })
+/**
+ * Component for displaying a form input with a disabled property
+ */
 export class DsDynamicDisabledComponent extends DynamicFormControlComponent {

  @Input() formId: string;
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.html
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.html
@@ -7,7 +7,7 @@
 </div>
 <div class="modal-body">
    <ngb-tabset>
-        <ngb-tab [title]="'submission.sections.describe.relationship-lookup.search-tab.tab-title.' + label | translate">
+        <ngb-tab [title]="'submission.sections.describe.relationship-lookup.search-tab.tab-title.' + label | translate  : {count: (totalInternal$ | async)}">
            <ng-template ngbTabContent>
                <ds-dynamic-lookup-relation-search-tab
                        [selection$]="selection$"
@@ -21,6 +21,20 @@
                </ds-dynamic-lookup-relation-search-tab>
            </ng-template>
        </ngb-tab>
+        <ngb-tab *ngFor="let source of (externalSourcesRD$ | async)?.payload?.page; let idx = index"
+                 [title]="'submission.sections.describe.relationship-lookup.search-tab.tab-title.' + source.id | translate  : {count: (totalExternal$ | async)[idx]}">
+            <ng-template ngbTabContent>
+                <ds-dynamic-lookup-relation-external-source-tab
+                        [listId]="listId"
+                        [repeatable]="repeatable"
+                        [context]="context"
+                        [externalSource]="source"
+                        (selectObject)="select($event)"
+                        (deselectObject)="deselect($event)"
+                        class="d-block pt-3">
+                </ds-dynamic-lookup-relation-external-source-tab>
+            </ng-template>
+        </ngb-tab>
        <ngb-tab [title]="'submission.sections.describe.relationship-lookup.selection-tab.tab-title' | translate : {count: (selection$ | async)?.length}">
            <ng-template ngbTabContent>
                <ds-dynamic-lookup-relation-selection-tab
@@ -42,4 +56,4 @@
    <div>
        <button type="button" class="btn btn-danger" (click)="close()">{{ ('submission.sections.describe.relationship-lookup.close' | translate) }}</button>
    </div>
-</div>
+</div>
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.spec.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.spec.ts
@@ -13,6 +13,12 @@ import { Item } from '../../../../../core/shared/item.model';
 import { ItemSearchResult } from '../../../../object-collection/shared/item-search-result.model';
 import { RelationshipOptions } from '../../models/relationship-options.model';
 import { AddRelationshipAction, RemoveRelationshipAction } from './relationship.actions';
+import { SearchConfigurationService } from '../../../../../core/shared/search/search-configuration.service';
+import { PaginatedSearchOptions } from '../../../../search/paginated-search-options.model';
+import { ExternalSource } from '../../../../../core/shared/external-source.model';
+import { createPaginatedList, createSuccessfulRemoteDataObject$ } from '../../../../testing/utils';
+import { ExternalSourceService } from '../../../../../core/data/external-source.service';
+import { LookupRelationService } from '../../../../../core/data/lookup-relation.service';

 describe('DsDynamicLookupRelationModalComponent', () => {
  let component: DsDynamicLookupRelationModalComponent;
@@ -28,6 +34,24 @@ describe('DsDynamicLookupRelationModalComponent', () => {
  let relationship;
  let nameVariant;
  let metadataField;
+  let pSearchOptions;
+  let externalSourceService;
+  let lookupRelationService;
+
+  const externalSources = [
+    Object.assign(new ExternalSource(), {
+      id: 'orcidV2',
+      name: 'orcidV2',
+      hierarchical: false
+    }),
+    Object.assign(new ExternalSource(), {
+      id: 'sherpaPublisher',
+      name: 'sherpaPublisher',
+      hierarchical: false
+    })
+  ];
+  const totalLocal = 10;
+  const totalExternal = 8;

  function init() {
    item = Object.assign(new Item(), { uuid: '7680ca97-e2bd-4398-bfa7-139a8673dc42', metadata: {} });
@@ -41,6 +65,14 @@ describe('DsDynamicLookupRelationModalComponent', () => {
    relationship = { filter: 'filter', relationshipType: 'isAuthorOfPublication', nameVariants: true } as RelationshipOptions;
    nameVariant = 'Doe, J.';
    metadataField = 'dc.contributor.author';
+    pSearchOptions = new PaginatedSearchOptions({});
+    externalSourceService = jasmine.createSpyObj('externalSourceService', {
+      findAll: createSuccessfulRemoteDataObject$(createPaginatedList(externalSources))
+    });
+    lookupRelationService = jasmine.createSpyObj('lookupRelationService', {
+      getTotalLocalResults: observableOf(totalLocal),
+      getTotalExternalResults: observableOf(totalExternal)
+    });
  }

  beforeEach(async(() => {
@@ -49,6 +81,13 @@ describe('DsDynamicLookupRelationModalComponent', () => {
      declarations: [DsDynamicLookupRelationModalComponent],
      imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([]), NgbModule.forRoot()],
      providers: [
+        {
+          provide: SearchConfigurationService, useValue: {
+            paginatedSearchOptions: observableOf(pSearchOptions)
+          }
+        },
+        { provide: ExternalSourceService, useValue: externalSourceService },
+        { provide: LookupRelationService, useValue: lookupRelationService },
        {
          provide: SelectableListService, useValue: selectableListService
        },
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/dynamic-lookup-relation-modal.component.ts
@@ -1,8 +1,8 @@
 import { Component, NgZone, OnDestroy, OnInit } from '@angular/core';
-import { combineLatest, Observable, Subscription } from 'rxjs';
+import { combineLatest, Observable, Subscription, zip as observableZip } from 'rxjs';
 import { NgbActiveModal } from '@ng-bootstrap/ng-bootstrap';
 import { hasValue } from '../../../../empty.util';
-import { map, skip, take } from 'rxjs/operators';
+import { map, skip, switchMap, take } from 'rxjs/operators';
 import { SEARCH_CONFIG_SERVICE } from '../../../../../+my-dspace-page/my-dspace-page.component';
 import { SearchConfigurationService } from '../../../../../core/shared/search/search-configuration.service';
 import { SelectableListService } from '../../../../object-list/selectable-list/selectable-list.service';
@@ -11,12 +11,24 @@ import { ListableObject } from '../../../../object-collection/shared/listable-ob
 import { RelationshipOptions } from '../../models/relationship-options.model';
 import { SearchResult } from '../../../../search/search-result.model';
 import { Item } from '../../../../../core/shared/item.model';
+import {
+  getAllSucceededRemoteData,
+  getRemoteDataPayload,
+  getSucceededRemoteData
+} from '../../../../../core/shared/operators';
 import { AddRelationshipAction, RemoveRelationshipAction, UpdateRelationshipAction } from './relationship.actions';
 import { RelationshipService } from '../../../../../core/data/relationship.service';
 import { RelationshipTypeService } from '../../../../../core/data/relationship-type.service';
 import { Store } from '@ngrx/store';
 import { AppState } from '../../../../../app.reducer';
 import { Context } from '../../../../../core/shared/context.model';
+import { Relationship } from '../../../../../core/shared/item-relationships/relationship.model';
+import { MetadataValue } from '../../../../../core/shared/metadata.models';
+import { LookupRelationService } from '../../../../../core/data/lookup-relation.service';
+import { RemoteData } from '../../../../../core/data/remote-data';
+import { PaginatedList } from '../../../../../core/data/paginated-list';
+import { ExternalSource } from '../../../../../core/shared/external-source.model';
+import { ExternalSourceService } from '../../../../../core/data/external-source.service';

@Component({
  selector: 'ds-dynamic-lookup-relation-modal',
@@ -34,23 +46,76 @@ import { Context } from '../../../../../core/shared/context.model';
 * Represents a modal where the submitter can select items to be added as a certain relationship type to the object being submitted
 */
 export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy {
+  /**
+   * The label to use to display i18n messages (describing the type of relationship)
+   */
  label: string;
+
+  /**
+   * Options for searching related items
+   */
  relationshipOptions: RelationshipOptions;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
  listId: string;
+
+  /**
+   * The item we're adding relationships to
+   */
  item;
+
+  /**
+   * Is the selection repeatable?
+   */
  repeatable: boolean;
+
+  /**
+   * The list of selected items
+   */
  selection$: Observable<ListableObject[]>;
+
+  /**
+   * The context to display lists
+   */
  context: Context;
+
+  /**
+   * The metadata-fields describing these relationships
+   */
  metadataFields: string;
+
+  /**
+   * A map of subscriptions within this component
+   */
  subMap: {
    [uuid: string]: Subscription
  } = {};

+  /**
+   * A list of the available external sources configured for this relationship
+   */
+  externalSourcesRD$: Observable<RemoteData<PaginatedList<ExternalSource>>>;
+
+  /**
+   * The total amount of internal items for the current options
+   */
+  totalInternal$: Observable<number>;
+
+  /**
+   * The total amount of results for each external source using the current options
+   */
+  totalExternal$: Observable<number[]>;
+
  constructor(
    public modal: NgbActiveModal,
    private selectableListService: SelectableListService,
    private relationshipService: RelationshipService,
    private relationshipTypeService: RelationshipTypeService,
+    private externalSourceService: ExternalSourceService,
+    private lookupRelationService: LookupRelationService,
+    private searchConfigService: SearchConfigurationService,
    private zone: NgZone,
    private store: Store<AppState>
  ) {
@@ -66,12 +131,20 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
    if (this.relationshipOptions.nameVariants) {
      this.context = Context.SubmissionModal;
    }
+
+    this.externalSourcesRD$ = this.externalSourceService.findAll();
+
+    this.setTotals();
  }

  close() {
    this.modal.close();
  }

+  /**
+   * Select (a list of) objects and add them to the store
+   * @param selectableObjects
+   */
  select(...selectableObjects: Array<SearchResult<Item>>) {
    this.zone.runOutsideAngular(
      () => {
@@ -99,6 +172,10 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
      });
  }

+  /**
+   * Add a subscription updating relationships with name variants
+   * @param sri The search result to track name variants for
+   */
  private addNameVariantSubscription(sri: SearchResult<Item>) {
    const nameVariant$ = this.relationshipService.getNameVariant(this.listId, sri.indexableObject.uuid);
    this.subMap[sri.indexableObject.uuid] = nameVariant$.pipe(
@@ -106,6 +183,10 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
    ).subscribe((nameVariant: string) => this.store.dispatch(new UpdateRelationshipAction(this.item, sri.indexableObject, this.relationshipOptions.relationshipType, nameVariant)))
  }

+  /**
+   * Deselect (a list of) objects and remove them from the store
+   * @param selectableObjects
+   */
  deselect(...selectableObjects: Array<SearchResult<Item>>) {
    this.zone.runOutsideAngular(
      () => selectableObjects.forEach((object) => {
@@ -115,6 +196,65 @@ export class DsDynamicLookupRelationModalComponent implements OnInit, OnDestroy
    );
  }

+  /**
+   * Set existing name variants for items by the item's virtual metadata
+   */
+  private setExistingNameVariants() {
+    const virtualMDs: MetadataValue[] = this.item.allMetadata(this.metadataFields).filter((mdValue) => mdValue.isVirtual);
+
+    const relatedItemPairs$: Observable<Array<[Item, Item]>> =
+      combineLatest(virtualMDs.map((md: MetadataValue) => this.relationshipService.findById(md.virtualValue).pipe(getSucceededRemoteData(), getRemoteDataPayload())))
+        .pipe(
+          switchMap((relationships: Relationship[]) => combineLatest(relationships.map((relationship: Relationship) =>
+              combineLatest(
+                relationship.leftItem.pipe(getSucceededRemoteData(), getRemoteDataPayload()),
+                relationship.rightItem.pipe(getSucceededRemoteData(), getRemoteDataPayload())
+              ))
+            )
+          )
+        );
+
+    const relatedItems$: Observable<Item[]> = relatedItemPairs$.pipe(
+      map((relatedItemPairs: Array<[Item, Item]>) => {
+        return relatedItemPairs
+          .map(([left, right]: [Item, Item]) => left.uuid === this.item.uuid ? left : right)
+      })
+    );
+
+    relatedItems$.pipe(take(1)).subscribe((relatedItems) => {
+        let index = 0;
+        virtualMDs.forEach(
+          (md: MetadataValue) => {
+            this.relationshipService.setNameVariant(this.listId, relatedItems[index].uuid, md.value);
+            index++;
+          }
+        );
+      }
+    )
+  }
+
+  /**
+   * Calculate and set the total entries available for each tab
+   */
+  setTotals() {
+    this.totalInternal$ = this.searchConfigService.paginatedSearchOptions.pipe(
+      switchMap((options) => this.lookupRelationService.getTotalLocalResults(this.relationshipOptions, options))
+    );
+
+    const externalSourcesAndOptions$ = combineLatest(
+      this.externalSourcesRD$.pipe(
+        getAllSucceededRemoteData(),
+        getRemoteDataPayload()
+      ),
+      this.searchConfigService.paginatedSearchOptions
+    );
+
+    this.totalExternal$ = externalSourcesAndOptions$.pipe(
+      switchMap(([sources, options]) =>
+        observableZip(...sources.page.map((source: ExternalSource) => this.lookupRelationService.getTotalExternalResults(source, options))))
+    );
+  }
+
  ngOnDestroy() {
    Object.values(this.subMap).forEach((subscription) => subscription.unsubscribe());
  }
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.html
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.html
@@ -0,0 +1,31 @@
+<div class="row">
+  <div class="col-4">
+    <h3>{{ 'submission.sections.describe.relationship-lookup.selection-tab.settings' | translate}}</h3>
+    <ds-page-size-selector></ds-page-size-selector>
+  </div>
+  <div class="col-8">
+    <ds-search-form [query]="(searchConfigService.paginatedSearchOptions | async)?.query" [inPlaceSearch]="true"></ds-search-form>
+    <div>
+      <h3>{{ 'submission.sections.describe.relationship-lookup.selection-tab.title.' + externalSource.id | translate}}</h3>
+      <ng-container *ngVar="(entriesRD$ | async) as entriesRD">
+        <ds-viewable-collection *ngIf="entriesRD?.hasSucceeded && !entriesRD?.isLoading && entriesRD?.payload?.page?.length > 0" @fadeIn
+                                [objects]="entriesRD"
+                                [selectable]="true"
+                                [selectionConfig]="{ repeatable: repeatable, listId: listId }"
+                                [config]="initialPagination"
+                                [hideGear]="true"
+                                [context]="context"
+                                (deselectObject)="deselectObject.emit($event)"
+                                (selectObject)="selectObject.emit($event)">
+        </ds-viewable-collection>
+        <ds-loading *ngIf="!entriesRD || !entriesRD?.payload || entriesRD?.isLoading"
+                    message="{{'loading.search-results' | translate}}"></ds-loading>
+        <ds-error   *ngIf="entriesRD?.hasFailed && (!entriesRD?.error || entriesRD?.error?.statusCode != 400)"
+                    message="{{'error.search-results' | translate}}"></ds-error>
+        <div *ngIf="entriesRD?.payload?.page?.length == 0 || entriesRD?.error?.statusCode == 400" id="empty-external-entry-list">
+          {{ 'search.results.empty' | translate }}
+        </div>
+      </ng-container>
+    </div>
+  </div>
+</div>
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.scss
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.scss
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.spec.ts
@@ -0,0 +1,162 @@
+import { DsDynamicLookupRelationExternalSourceTabComponent } from './dynamic-lookup-relation-external-source-tab.component';
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { VarDirective } from '../../../../../utils/var.directive';
+import { TranslateModule } from '@ngx-translate/core';
+import { RouterTestingModule } from '@angular/router/testing';
+import { NO_ERRORS_SCHEMA } from '@angular/core';
+import { PaginatedSearchOptions } from '../../../../../search/paginated-search-options.model';
+import { SearchConfigurationService } from '../../../../../../core/shared/search/search-configuration.service';
+import { of as observableOf } from 'rxjs/internal/observable/of';
+import {
+  createFailedRemoteDataObject$,
+  createPaginatedList,
+  createPendingRemoteDataObject$,
+  createSuccessfulRemoteDataObject$
+} from '../../../../../testing/utils';
+import { ExternalSourceService } from '../../../../../../core/data/external-source.service';
+import { ExternalSource } from '../../../../../../core/shared/external-source.model';
+import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
+import { By } from '@angular/platform-browser';
+import { ExternalSourceEntry } from '../../../../../../core/shared/external-source-entry.model';
+
+describe('DsDynamicLookupRelationExternalSourceTabComponent', () => {
+  let component: DsDynamicLookupRelationExternalSourceTabComponent;
+  let fixture: ComponentFixture<DsDynamicLookupRelationExternalSourceTabComponent>;
+  let pSearchOptions;
+  let externalSourceService;
+
+  const externalSource = {
+    id: 'orcidV2',
+    name: 'orcidV2',
+    hierarchical: false
+  } as ExternalSource;
+  const externalEntries = [
+    Object.assign({
+      id: '0001-0001-0001-0001',
+      display: 'John Doe',
+      value: 'John, Doe',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0001'
+          }
+        ]
+      }
+    }),
+    Object.assign({
+      id: '0001-0001-0001-0002',
+      display: 'Sampson Megan',
+      value: 'Sampson, Megan',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0002'
+          }
+        ]
+      }
+    }),
+    Object.assign({
+      id: '0001-0001-0001-0003',
+      display: 'Edwards Anna',
+      value: 'Edwards, Anna',
+      metadata: {
+        'dc.identifier.uri': [
+          {
+            value: 'https://orcid.org/0001-0001-0001-0003'
+          }
+        ]
+      }
+    })
+  ] as ExternalSourceEntry[];
+
+  function init() {
+    pSearchOptions = new PaginatedSearchOptions({
+      query: 'test'
+    });
+    externalSourceService = jasmine.createSpyObj('externalSourceService', {
+      getExternalSourceEntries: createSuccessfulRemoteDataObject$(createPaginatedList(externalEntries))
+    });
+  }
+
+  beforeEach(async(() => {
+    init();
+    TestBed.configureTestingModule({
+      declarations: [DsDynamicLookupRelationExternalSourceTabComponent, VarDirective],
+      imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([]), BrowserAnimationsModule],
+      providers: [
+        {
+          provide: SearchConfigurationService, useValue: {
+            paginatedSearchOptions: observableOf(pSearchOptions)
+          }
+        },
+        { provide: ExternalSourceService, useValue: externalSourceService }
+      ],
+      schemas: [NO_ERRORS_SCHEMA]
+    }).compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(DsDynamicLookupRelationExternalSourceTabComponent);
+    component = fixture.componentInstance;
+    component.externalSource = externalSource;
+    fixture.detectChanges();
+  });
+
+  describe('when the external entries finished loading successfully', () => {
+    it('should display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeDefined();
+    });
+  });
+
+  describe('when the external entries are loading', () => {
+    beforeEach(() => {
+      component.entriesRD$ = createPendingRemoteDataObject$(undefined);
+      fixture.detectChanges();
+    });
+
+    it('should not display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeNull();
+    });
+
+    it('should display a ds-loading component', () => {
+      const loading = fixture.debugElement.query(By.css('ds-loading'));
+      expect(loading).not.toBeNull();
+    });
+  });
+
+  describe('when the external entries failed loading', () => {
+    beforeEach(() => {
+      component.entriesRD$ = createFailedRemoteDataObject$(undefined);
+      fixture.detectChanges();
+    });
+
+    it('should not display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeNull();
+    });
+
+    it('should display a ds-error component', () => {
+      const error = fixture.debugElement.query(By.css('ds-error'));
+      expect(error).not.toBeNull();
+    });
+  });
+
+  describe('when the external entries return an empty list', () => {
+    beforeEach(() => {
+      component.entriesRD$ = createSuccessfulRemoteDataObject$(createPaginatedList([]));
+      fixture.detectChanges();
+    });
+
+    it('should not display a ds-viewable-collection component', () => {
+      const collection = fixture.debugElement.query(By.css('ds-viewable-collection'));
+      expect(collection).toBeNull();
+    });
+
+    it('should display a message the list is empty', () => {
+      const empty = fixture.debugElement.query(By.css('#empty-external-entry-list'));
+      expect(empty).not.toBeNull();
+    });
+  });
+});
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component.ts
@@ -0,0 +1,96 @@
+import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
+import { SEARCH_CONFIG_SERVICE } from '../../../../../../+my-dspace-page/my-dspace-page.component';
+import { SearchConfigurationService } from '../../../../../../core/shared/search/search-configuration.service';
+import { Router } from '@angular/router';
+import { ExternalSourceService } from '../../../../../../core/data/external-source.service';
+import { Observable } from 'rxjs/internal/Observable';
+import { RemoteData } from '../../../../../../core/data/remote-data';
+import { PaginatedList } from '../../../../../../core/data/paginated-list';
+import { ExternalSourceEntry } from '../../../../../../core/shared/external-source-entry.model';
+import { ExternalSource } from '../../../../../../core/shared/external-source.model';
+import { startWith, switchMap } from 'rxjs/operators';
+import { PaginatedSearchOptions } from '../../../../../search/paginated-search-options.model';
+import { Context } from '../../../../../../core/shared/context.model';
+import { ListableObject } from '../../../../../object-collection/shared/listable-object.model';
+import { fadeIn, fadeInOut } from '../../../../../animations/fade';
+import { PaginationComponentOptions } from '../../../../../pagination/pagination-component-options.model';
+
+@Component({
+  selector: 'ds-dynamic-lookup-relation-external-source-tab',
+  styleUrls: ['./dynamic-lookup-relation-external-source-tab.component.scss'],
+  templateUrl: './dynamic-lookup-relation-external-source-tab.component.html',
+  providers: [
+    {
+      provide: SEARCH_CONFIG_SERVICE,
+      useClass: SearchConfigurationService
+    }
+  ],
+  animations: [
+    fadeIn,
+    fadeInOut
+  ]
+})
+/**
+ * The tab displaying a list of importable entries for an external source
+ */
+export class DsDynamicLookupRelationExternalSourceTabComponent implements OnInit {
+  /**
+   * The label to use to display i18n messages (describing the type of relationship)
+   */
+  @Input() label: string;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
+  @Input() listId: string;
+
+  /**
+   * Is the selection repeatable?
+   */
+  @Input() repeatable: boolean;
+
+  /**
+   * The context to display lists
+   */
+  @Input() context: Context;
+
+  /**
+   * Send an event to deselect an object from the list
+   */
+  @Output() deselectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Send an event to select an object from the list
+   */
+  @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * The initial pagination to start with
+   */
+  initialPagination = Object.assign(new PaginationComponentOptions(), {
+    id: 'submission-external-source-relation-list',
+    pageSize: 5
+  });
+
+  /**
+   * The external source we're selecting entries for
+   */
+  @Input() externalSource: ExternalSource;
+
+  /**
+   * The displayed list of entries
+   */
+  entriesRD$: Observable<RemoteData<PaginatedList<ExternalSourceEntry>>>;
+
+  constructor(private router: Router,
+              public searchConfigService: SearchConfigurationService,
+              private externalSourceService: ExternalSourceService) {
+  }
+
+  ngOnInit(): void {
+    this.entriesRD$ = this.searchConfigService.paginatedSearchOptions.pipe(
+      switchMap((searchOptions: PaginatedSearchOptions) =>
+        this.externalSourceService.getExternalSourceEntries(this.externalSource.id, searchOptions).pipe(startWith(undefined)))
+    )
+  }
+}
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.html
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.html
@@ -3,7 +3,7 @@
                       [resultCount]="(resultsRD$ | async)?.payload?.totalElements"
                       [inPlaceSearch]="true" [showViewModes]="false"></ds-search-sidebar>
    <div class="col-8">
-        <ds-search-form [inPlaceSearch]="true"></ds-search-form>
+        <ds-search-form [query]="(searchConfigService.paginatedSearchOptions | async)?.query" [inPlaceSearch]="true"></ds-search-form>

        <ds-search-labels [inPlaceSearch]="true"></ds-search-labels>

@@ -56,8 +56,8 @@
            </div>
        </div>
        <ds-search-results [searchResults]="(resultsRD$ | async)"
-                           [sortConfig]="this.searchConfig?.sort"
-                           [searchConfig]="this.searchConfig"
+                           [sortConfig]="this.lookupRelationService.searchConfig?.sort"
+                           [searchConfig]="this.lookupRelationService.searchConfig"
                           [selectable]="true"
                           [selectionConfig]="{ repeatable: repeatable, listId: listId }"
                           [linkType]="linkTypes.ExternalLink"
@@ -66,4 +66,4 @@
                           (selectObject)="selectObject.emit($event)">
        </ds-search-results>
    </div>
-</div>
+</div>
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.spec.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.spec.ts
@@ -15,6 +15,8 @@ import { createSuccessfulRemoteDataObject$ } from '../../../../../testing/utils'
 import { PaginatedList } from '../../../../../../core/data/paginated-list';
 import { ItemSearchResult } from '../../../../../object-collection/shared/item-search-result.model';
 import { Item } from '../../../../../../core/shared/item.model';
+import { ActivatedRoute } from '@angular/router';
+import { LookupRelationService } from '../../../../../../core/data/lookup-relation.service';

 describe('DsDynamicLookupRelationSearchTabComponent', () => {
  let component: DsDynamicLookupRelationSearchTabComponent;
@@ -34,6 +36,7 @@ describe('DsDynamicLookupRelationSearchTabComponent', () => {

  let results;
  let selectableListService;
+  let lookupRelationService;

  function init() {
    relationship = { filter: 'filter', relationshipType: 'isAuthorOfPublication', nameVariants: true } as RelationshipOptions;
@@ -51,6 +54,10 @@ describe('DsDynamicLookupRelationSearchTabComponent', () => {

    results = new PaginatedList(undefined, [searchResult1, searchResult2, searchResult3]);
    selectableListService = jasmine.createSpyObj('selectableListService', ['deselect', 'select', 'deselectAll']);
+    lookupRelationService = jasmine.createSpyObj('lookupRelationService', {
+      getLocalResults: createSuccessfulRemoteDataObject$(results)
+    });
+    lookupRelationService.searchConfig = {};
  }

  beforeEach(async(() => {
@@ -75,6 +82,8 @@ describe('DsDynamicLookupRelationSearchTabComponent', () => {
            }
          }
        },
+        { provide: ActivatedRoute, useValue: { snapshot: { queryParams: {} } } },
+        { provide: LookupRelationService, useValue: lookupRelationService }
      ],
      schemas: [NO_ERRORS_SCHEMA]
    })
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/search-tab/dynamic-lookup-relation-search-tab.component.ts
@@ -11,14 +11,16 @@ import { RelationshipOptions } from '../../../models/relationship-options.model'
 import { PaginationComponentOptions } from '../../../../../pagination/pagination-component-options.model';
 import { ListableObject } from '../../../../../object-collection/shared/listable-object.model';
 import { SearchService } from '../../../../../../core/shared/search/search.service';
-import { Router } from '@angular/router';
+import { ActivatedRoute, Router } from '@angular/router';
 import { SelectableListService } from '../../../../../object-list/selectable-list/selectable-list.service';
 import { hasValue, isNotEmpty } from '../../../../../empty.util';
 import { concat, map, multicast, switchMap, take, takeWhile, tap } from 'rxjs/operators';
+import { DSpaceObject } from '../../../../../../core/shared/dspace-object.model';
 import { getSucceededRemoteData } from '../../../../../../core/shared/operators';
 import { RouteService } from '../../../../../../core/services/route.service';
 import { CollectionElementLinkType } from '../../../../../object-collection/collection-element-link.type';
 import { Context } from '../../../../../../core/shared/context.model';
+import { LookupRelationService } from '../../../../../../core/data/lookup-relation.service';

@Component({
  selector: 'ds-dynamic-lookup-relation-search-tab',
@@ -36,32 +38,87 @@ import { Context } from '../../../../../../core/shared/context.model';
 * Tab for inside the lookup model that represents the items that can be used as a relationship in this submission
 */
 export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDestroy {
+  /**
+   * Options for searching related items
+   */
  @Input() relationship: RelationshipOptions;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
  @Input() listId: string;
+
+  /**
+   * Is the selection repeatable?
+   */
  @Input() repeatable: boolean;
+
+  /**
+   * The list of selected items
+   */
  @Input() selection$: Observable<ListableObject[]>;
+
+  /**
+   * The context to display lists
+   */
  @Input() context: Context;

+  /**
+   * Send an event to deselect an object from the list
+   */
  @Output() deselectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Send an event to select an object from the list
+   */
  @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Search results
+   */
  resultsRD$: Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
-  searchConfig: PaginatedSearchOptions;
+
+  /**
+   * Are all results selected?
+   */
  allSelected: boolean;
+
+  /**
+   * Are some results selected?
+   */
  someSelected$: Observable<boolean>;
+
+  /**
+   * Is it currently loading to select all results?
+   */
  selectAllLoading: boolean;
+
+  /**
+   * Subscription to unsubscribe from
+   */
  subscription;
+
+  /**
+   * The initial pagination to use
+   */
  initialPagination = Object.assign(new PaginationComponentOptions(), {
    id: 'submission-relation-list',
    pageSize: 5
  });
+
+  /**
+   * The type of links to display
+   */
  linkTypes = CollectionElementLinkType;

  constructor(
    private searchService: SearchService,
    private router: Router,
+    private route: ActivatedRoute,
    private selectableListService: SelectableListService,
-    private searchConfigService: SearchConfigurationService,
+    public searchConfigService: SearchConfigurationService,
    private routeService: RouteService,
+    public lookupRelationService: LookupRelationService
  ) {
  }

@@ -75,24 +132,8 @@ export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDest

    this.someSelected$ = this.selection$.pipe(map((selection) => isNotEmpty(selection)));
    this.resultsRD$ = this.searchConfigService.paginatedSearchOptions.pipe(
-      map((options) => {
-        return Object.assign(new PaginatedSearchOptions({}), options, { fixedFilter: this.relationship.filter, configuration: this.relationship.searchConfiguration })
-      }),
-      switchMap((options) => {
-        this.searchConfig = options;
-        return this.searchService.search(options).pipe(
-          /* Make sure to only listen to the first x results, until loading is finished */
-          /* TODO: in Rxjs 6.4.0 and up, we can replace this with takeWhile(predicate, true) - see https://stackoverflow.com/a/44644237 */
-          multicast(
-            () => new ReplaySubject(1),
-            (subject) => subject.pipe(
-              takeWhile((rd: RemoteData<PaginatedList<SearchResult<Item>>>) => rd.isLoading),
-              concat(subject.pipe(take(1)))
-            )
-          ) as any
-        )
-      })
-    ) as Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
+      switchMap((options) => this.lookupRelationService.getLocalResults(this.relationship, options))
+    );
  }

  /**
@@ -100,7 +141,7 @@ export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDest
   */
  resetRoute() {
    this.router.navigate([], {
-      queryParams: Object.assign({}, { page: 1, pageSize: this.initialPagination.pageSize }),
+      queryParams: Object.assign({}, { pageSize: this.initialPagination.pageSize }, this.route.snapshot.queryParams, { page: 1 })
    });
  }

@@ -143,7 +184,7 @@ export class DsDynamicLookupRelationSearchTabComponent implements OnInit, OnDest
      currentPage: 1,
      pageSize: 9999
    });
-    const fullSearchConfig = Object.assign(this.searchConfig, { pagination: fullPagination });
+    const fullSearchConfig = Object.assign(this.lookupRelationService.searchConfig, { pagination: fullPagination });
    const results$ = this.searchService.search(fullSearchConfig) as Observable<RemoteData<PaginatedList<SearchResult<Item>>>>;
    results$.pipe(
      getSucceededRemoteData(),
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/selection-tab/dynamic-lookup-relation-selection-tab.component.spec.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/selection-tab/dynamic-lookup-relation-selection-tab.component.spec.ts
@@ -73,11 +73,6 @@ describe('DsDynamicLookupRelationSelectionTabComponent', () => {
    expect(component).toBeTruthy();
  });

-  it('should call navigate on the router when is called resetRoute', () => {
-    component.resetRoute();
-    expect(router.navigate).toHaveBeenCalled();
-  });
-
  it('should call navigate on the router when is called resetRoute', () => {
    component.selectionRD$ = createSelection([]);
    fixture.detectChanges();
--- a/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/selection-tab/dynamic-lookup-relation-selection-tab.component.ts
+++ b/src/app/shared/form/builder/ds-dynamic-form-ui/relation-lookup-modal/selection-tab/dynamic-lookup-relation-selection-tab.component.ts
@@ -29,15 +29,49 @@ import { Context } from '../../../../../../core/shared/context.model';
 * Tab for inside the lookup model that represents the currently selected relationships
 */
 export class DsDynamicLookupRelationSelectionTabComponent {
+  /**
+   * The label to use to display i18n messages (describing the type of relationship)
+   */
  @Input() label: string;
+
+  /**
+   * The ID of the list to add/remove selected items to/from
+   */
  @Input() listId: string;
+
+  /**
+   * Is the selection repeatable?
+   */
  @Input() repeatable: boolean;
+
+  /**
+   * The list of selected items
+   */
  @Input() selection$: Observable<ListableObject[]>;
+
+  /**
+   * The paginated list of selected items
+   */
  @Input() selectionRD$: Observable<RemoteData<PaginatedList<ListableObject>>>;
+
+  /**
+   * The context to display lists
+   */
  @Input() context: Context;
+
+  /**
+   * Send an event to deselect an object from the list
+   */
  @Output() deselectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();
+
+  /**
+   * Send an event to select an object from the list
+   */
  @Output() selectObject: EventEmitter<ListableObject> = new EventEmitter<ListableObject>();

+  /**
+   * The initial pagination to use
+   */
  initialPagination = Object.assign(new PaginationComponentOptions(), {
    id: 'submission-relation-list',
    pageSize: 5
@@ -51,7 +85,6 @@ export class DsDynamicLookupRelationSelectionTabComponent {
   * Set up the selection and pagination on load
   */
  ngOnInit() {
-    this.resetRoute();
    this.selectionRD$ = this.searchConfigService.paginatedSearchOptions
      .pipe(
        map((options: PaginatedSearchOptions) => options.pagination),
@@ -75,13 +108,4 @@ export class DsDynamicLookupRelationSelectionTabComponent {
        })
      )
  }
-
-  /**
-   * Method to reset the route when the window is opened to make sure no strange pagination issues appears
-   */
-  resetRoute() {
-    this.router.navigate([], {
-      queryParams: Object.assign({}, { page: 1, pageSize: this.initialPagination.pageSize }),
-    });
-  }
 }
--- a/src/app/shared/pagination/pagination.component.ts
+++ b/src/app/shared/pagination/pagination.component.ts
@@ -225,10 +225,14 @@ export class PaginationComponent implements OnDestroy, OnInit {
  }

  /**
+   * @param cdRef
+   *    ChangeDetectorRef is a singleton service provided by Angular.
   * @param route
   *    Route is a singleton service provided by Angular.
   * @param router
   *    Router is a singleton service provided by Angular.
+   * @param hostWindowService
+   *    the HostWindowService singleton.
   */
  constructor(private cdRef: ChangeDetectorRef,
              private route: ActivatedRoute,
@@ -243,7 +247,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
   *    The page being navigated to.
   */
  public doPageChange(page: number) {
-    this.updateRoute({ page: page.toString() });
+    this.updateRoute({ pageId: this.id, page: page.toString() });
  }

  /**
@@ -253,7 +257,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
   *    The page size being navigated to.
   */
  public doPageSizeChange(pageSize: number) {
-    this.updateRoute({ page: 1, pageSize: pageSize });
+    this.updateRoute({ pageId: this.id, page: 1, pageSize: pageSize });
  }

  /**
@@ -263,7 +267,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
   *    The sort direction being navigated to.
   */
  public doSortDirectionChange(sortDirection: SortDirection) {
-    this.updateRoute({ page: 1, sortDirection: sortDirection });
+    this.updateRoute({ pageId: this.id, page: 1, sortDirection: sortDirection });
  }

  /**
@@ -273,7 +277,7 @@ export class PaginationComponent implements OnDestroy, OnInit {
   *    The sort field being navigated to.
   */
  public doSortFieldChange(field: string) {
-    this.updateRoute({ page: 1, sortField: field });
+    this.updateRoute({ pageId: this.id, page: 1, sortField: field });
  }

  /**
@@ -413,27 +417,30 @@ export class PaginationComponent implements OnDestroy, OnInit {
   * Method to update all pagination variables to the current query parameters
   */
  private setFields() {
-    // (+) converts string to a number
-    const page = this.currentQueryParams.page;
-    if (this.currentPage !== +page) {
-      this.setPage(+page);
-    }
+    // set fields only when page id is the one configured for this pagination instance
+    if (this.currentQueryParams.pageId === this.id) {
+      // (+) converts string to a number
+      const page = this.currentQueryParams.page;
+      if (this.currentPage !== +page) {
+        this.setPage(+page);
+      }

-    const pageSize = this.currentQueryParams.pageSize;
-    if (this.pageSize !== +pageSize) {
-      this.setPageSize(+pageSize);
-    }
+      const pageSize = this.currentQueryParams.pageSize;
+      if (this.pageSize !== +pageSize) {
+        this.setPageSize(+pageSize);
+      }

-    const sortDirection = this.currentQueryParams.sortDirection;
-    if (this.sortDirection !== sortDirection) {
-      this.setSortDirection(sortDirection);
-    }
+      const sortDirection = this.currentQueryParams.sortDirection;
+      if (this.sortDirection !== sortDirection) {
+        this.setSortDirection(sortDirection);
+      }

-    const sortField = this.currentQueryParams.sortField;
-    if (this.sortField !== sortField) {
-      this.setSortField(sortField);
+      const sortField = this.currentQueryParams.sortField;
+      if (this.sortField !== sortField) {
+        this.setSortField(sortField);
+      }
+      this.cdRef.detectChanges();
    }
-    this.cdRef.detectChanges();
  }

  /**
--- a/src/app/shared/shared.module.ts
+++ b/src/app/shared/shared.module.ts
@@ -48,10 +48,7 @@ import { LogOutComponent } from './log-out/log-out.component';
 import { FormComponent } from './form/form.component';
 import { DsDynamicTypeaheadComponent } from './form/builder/ds-dynamic-form-ui/models/typeahead/dynamic-typeahead.component';
 import { DsDynamicScrollableDropdownComponent } from './form/builder/ds-dynamic-form-ui/models/scrollable-dropdown/dynamic-scrollable-dropdown.component';
-import {
-  DsDynamicFormControlContainerComponent,
-  dsDynamicFormControlMapFn
-} from './form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component';
+import { DsDynamicFormControlContainerComponent, dsDynamicFormControlMapFn } from './form/builder/ds-dynamic-form-ui/ds-dynamic-form-control-container.component';
 import { DsDynamicFormComponent } from './form/builder/ds-dynamic-form-ui/ds-dynamic-form.component';
 import { DYNAMIC_FORM_CONTROL_MAP_FN, DynamicFormsCoreModule } from '@ng-dynamic-forms/core';
 import { DynamicFormsNGBootstrapUIModule } from '@ng-dynamic-forms/ui-ng-bootstrap';
@@ -174,8 +171,8 @@ import { PageWithSidebarComponent } from './sidebar/page-with-sidebar.component'
 import { SidebarDropdownComponent } from './sidebar/sidebar-dropdown.component';
 import { SidebarFilterComponent } from './sidebar/filter/sidebar-filter.component';
 import { SidebarFilterSelectedOptionComponent } from './sidebar/filter/sidebar-filter-selected-option.component';
-import { MetadataRepresentationListComponent } from '../+item-page/simple/metadata-representation-list/metadata-representation-list.component';
 import { SelectableListItemControlComponent } from './object-collection/shared/selectable-list-item-control/selectable-list-item-control.component';
+import { DsDynamicLookupRelationExternalSourceTabComponent } from './form/builder/ds-dynamic-form-ui/relation-lookup-modal/external-source-tab/dynamic-lookup-relation-external-source-tab.component';
 import { DragDropModule } from '@angular/cdk/drag-drop';
 import { ExistingMetadataListElementComponent } from './form/builder/ds-dynamic-form-ui/existing-metadata-list-element/existing-metadata-list-element.component';

@@ -399,7 +396,8 @@ const ENTRY_COMPONENTS = [
  SearchFacetRangeOptionComponent,
  SearchAuthorityFilterComponent,
  DsDynamicLookupRelationSearchTabComponent,
-  DsDynamicLookupRelationSelectionTabComponent
+  DsDynamicLookupRelationSelectionTabComponent,
+  DsDynamicLookupRelationExternalSourceTabComponent
 ];

 const SHARED_ITEM_PAGE_COMPONENTS = [
--- a/tslint.json
+++ b/tslint.json
@@ -40,7 +40,7 @@
    ],
    "no-access-missing-member": false,
    "no-arg": true,
-    "no-attribute-parameter-decorator": true,
+    "no-attribute-decorator": true,
    "no-bitwise": true,
    "no-console": [
      true,
@@ -81,9 +81,8 @@
      false
    ],
    "prefer-const": true,
-    "pipe-naming": [
+    "pipe-prefix": [
      true,
-      "camelCase",
      "ds"
    ],
    "quotemark": [
@@ -154,10 +153,10 @@
    "no-input-rename": true,
    "no-output-rename": true,
    "templates-use-public": false,
-    "use-host-property-decorator": true,
-    "use-input-property-decorator": true,
+    "no-host-metadata-property": true,
+    "no-inputs-metadata-property": true,
    "use-life-cycle-interface": false,
-    "use-output-property-decorator": true,
+    "no-outputs-metadata-property": true,
    "use-pipe-transform-interface": true
 //    "rxjs-collapse-imports": true,
 //    "rxjs-pipeable-operators-only": true,