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abstractSummary of the article or artifact
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classificationThe assignment to an organizing scheme
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contributorshipAttribution of authors and other contributors
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currentThe status of the cited artifact
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dateWhen the cited artifact was accessed
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extensionAdditional content defined by implementations
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idUnique id for inter-element referencing
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identifierMay include DOI, PMID, PMCID, etc.
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modifierExtensions that cannot be ignored even if unrecognized
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noteAny additional information or content for the article or artifact
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partThe component of the article or artifact
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publicationIf multiple, used to represent alternative forms of the article that are not separate citations
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relatedMay include trial registry identifiers
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relatesThe artifact related to the cited artifact
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statusAn effective date or period for a status of the cited artifact
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titleThe title details of the article or artifact
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versionThe defined version of the cited artifact
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webUsed for any URL for the article or artifact cited
When the cited artifact was accessed