Keywords (R)

Subject(s), keyword(s), classification code(s), or key phrase(s) describing the resource (occurrences: 0-n). Try to use keyword thesauri from community-specific vocabularies.

Allowed values, examples, other constraints

List of strings.

Example

1<keywords>
2     <keyword>Chemistry</keyword>
3     <keyword>Catalysis</keyword>
4     <keyword>Confinement</keyword>
5     <keyword>Metathesis</keyword>
6</keywords>