representation metalanguage character set operator document stage formal language encodee specification serialization syntax legal entity document operatee technology membership expressor encoder authorship editorship application domain approval subclass sort usee protocol user data model usage interface definition language organization query language programming language representor superclass containment operation expressee character encoding standards body subdivision constraint language member container standards body author representee person processing language contribution data model representation editor superclass(es) subclass(es) superclass-subclass relationship document/document stage expression contributor encoding collection application programming interface maintenance containee