A Theorem, Lemma, Proof, Postulate, Hypothesis, Proposition, Corollary, or other formal statement, identified as such with a label, usually made typographically distinct from the surrounding text.
The following, in order:
<editing-instruction> Editing Instruction, zero or more
<label> Label of a Figure, Reference, Etc., zero or one
<kwd-group> Keyword Group, zero or more
<subj-group> Subject Group, zero or more
One or more of any of:
Any combination of:
Ownership Elements