Optional
_documentOptional
_presentationEducational material presentation date
Optional
_publicationEducational material publication date
Optional
_referenceEducational material reference pointer
Optional
documentEducational material document identifier
Optional
extensionAdditional content defined by implementations
Optional
idUnique id for inter-element referencing
Optional
modifierExtensions that cannot be ignored even if unrecognized
Optional
presentationEducational material presentation date
Optional
publicationEducational material publication date
Optional
referenceEducational material reference pointer
Educational material document identifier