SUBJECT
Description: Terms or phrases that describe, identify, or interpret the Work or Image and what it depicts or expresses. These may include generic terms that describe the work and the elements that it comprises, terms that identify particular people, geographic places, narrative and iconographic themes, or terms that refer to broader concepts or interpretations. Use of a Subject Authority, from which these data values may be derived, is recommended. See CCO: Part THREE: Subject Authority (A.4) for a more thorough discussion. The global source attribute may be used to isolate local collection or user-supplied terminology that is not controlled by any authority.