6. Subject (R)

Subject, keyword, classification code, or key phrase describing the resource (occurrences: 0-n).

Allowed values, examples, other constraints

Free text.

6.1 subjectScheme (O)

The name of the subject scheme or classification code or authority if one is used (occurrences: 01).

Allowed values, examples, other constraints

Free text.

6.2 schemeURI (O)

The URI of the subject identifier scheme (occurrences: 0-1).

Allowed values, examples, other constraints

Examples:

• http://id.loc.gov/authorities/subjects
• http://dewey.info/

Example

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