{{ $id := .Get "id" | default "" -}} {{ if not $id -}} {{ errorf "Missing value for param 'id': %s" .Position -}} {{ end -}} {{ $class := .Get "class" | default "" }} {{- $body := trim .Inner " \r\n" -}} {{ if not $body -}} {{ errorf "Missing inner element text: %s" .Position -}} {{ end -}}