Optional_OptionalabstractSummary of the article or artifact
OptionalclassificationThe assignment to an organizing scheme
OptionalcontributorshipAttribution of authors and other contributors
OptionalcurrentThe status of the cited artifact
OptionaldateWhen the cited artifact was accessed
OptionalextensionAdditional content defined by implementations
OptionalidUnique id for inter-element referencing
OptionalidentifierMay include DOI, PMID, PMCID, etc.
OptionalmodifierExtensions that cannot be ignored even if unrecognized
OptionalnoteAny additional information or content for the article or artifact
OptionalpartThe component of the article or artifact
OptionalpublicationIf multiple, used to represent alternative forms of the article that are not separate citations
OptionalrelatedMay include trial registry identifiers
OptionalrelatesThe artifact related to the cited artifact
OptionalstatusAn effective date or period for a status of the cited artifact
OptionaltitleThe title details of the article or artifact
OptionalversionThe defined version of the cited artifact
OptionalwebUsed for any URL for the article or artifact cited
When the cited artifact was accessed