Defines which metadatum is mapped on which metadatum. Note that while the key must be unique it only matters here for postprocessing of the value. The mapped MetadatumContributor has full control over what metadatafield is generated. yyyy-MMM-dd yyyy-MMM yyyy-MM-dd yyyy Defines how an org.dspace.content.Item is mapped to a query in scopus. Please note that exactly one of these must be present. If multiple are present the result is undefined.