Flesh out the set of constant subject identifiers
Flesh out the set of constant subject identifiers

These are all from ISO 13250-2, "Topic Maps — Data Model":
http://www.isotopicmaps.org/sam/sam-model/

google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps,google/note-maps