C.3.1:1 - Problem Frame

A practice/source boundary is provenance and a comparison cue. It affects the continuity decision only when comparison exposes a real difference in the candidate domain or membership distinction.

U.SubkindOf is separately admitted by E24UK-AR-USUBKINDOF-R5-01 as a same-individual dependent kind under U.Relation. Its participants are an exact narrower kind and broader kind. An effective reference scheme and aligned KindSignature editions make the criteria interpretable and qualify applicability; they are not relation participants or occurrence-identity discriminators. Candidate state, context slice, declaration edition, kind identity, and one obtaining subkind relation can therefore change for different reasons.