Subject (MA, 0-n)

datacite:subject

Subject, keyword, classification code, or key phrase describing the resource.

Allowed values, other constraints:

• In general, choose the most significant and unique words for keywords, avoiding those too general to describe a particular resource.
• Usage of a controlled thesaurus or classification is highly recommended.
• For keywords/keyphrases that are not controlled by a vocabulary or thesaurus:
  • Either encode multiple terms with a semi-colon separating each keyword/keyphrase, or repeat the element for each term.
  • There are no requirements regarding the capitalization of keywords though internal (within archive) consistency is recommended.
• Where terms are taken from a standard classification schema or controlled vocabulary:
  • Encode each term using the additional attributes of the subject property. Encode the complete subject descriptor according to the relevant scheme.
  • Use the capitalisation and punctuation used in the original scheme.
  • It is recommended to use an URI especially when codified schemes are used like DDC or UDC. Service providers can recognise encoding schemas more easily when the schema is “URI-fied” by an authority namespace.
  • If no specific classification scheme is used we recommend the Dewey Decimal Classification (DDC). More information about the DDC and the DDC Summaries can be found at https://www.oclc.org/en/dewey/resources.html . Please note that OCLC owns all copyright rights in the Dewey Decimal Classification system. Dewey, Dewey Decimal Classification, DDC, OCLC and WebDewey are registered trademarks of OCLC.

Property subject (MA, 0-n)

Use subject name or keyword as value.

Attribute subjectScheme (O, 0-1)

The name of the subject scheme or classification code or authority if one is used.

Exemplary values:

• DDC - |DDC|
• STW - |STW|
• AGROVOC - |AGROVOC|

Attribute schemeURI (O, 0-1)

The URI of the subject identifier scheme.

Exemplary values:

• http://id.loc.gov/authorities/subjects
• http://zbw.eu/stw
• http://aims.fao.org/standards/agrovoc

Attribute valueURI (O, 0-1)

The URI of the subject term.

Attribute xml:lang (R, 0-1)

The language of the subject synonym.

Recommended value lists:

• IETF BCP 47 - |IETF BCP 47|
• ISO 639-x - |ISO 639-x|

Examples

<datacite:subjects>
 <datacite:subject>Earth sciences and geology</datacite:subject>
 <datacite:subject subjectScheme="DDC" schemeURI="http://dewey.info/" valueURI="">
 551 Geology, hydrology, meteorology
 </datacite:subject>
</datacite:subjects>

Context

Do Not Confuse With

• Description (MA, 0-n) (Use description for an abstract)
• Title (M, 1-n) (Use title for the name of the resource)
• Resource Type (M, 1) (Use resourceType for the type)

DataCite v4.3 Differentiation

• `xml:lang`_ is recommenced in OpenAIRE instead of optional in DataCite.

OpenAIRE Data Guidelines v Differentiation

• `xml:lang`_ is newly added.
• `valueUri`_ is newly added.