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:
Example
1<subjects>
2 <subject>Earth sciences and geology</subject>
3 <subject subjectScheme="DDC" schemeURI="http://dewey.info/">
4 551 Geology, hydrology, meteorology
5 </subject>
6</subjects>