sdd:SourceScopeCopy as claim

A sdd:SourceScope is the scope backing a diagram's @source<label>(<endpoint>) block — the home for facts cited from one external endpoint (spec §3.1's F-claimed class). It doubles as an sd:Claim instance: sd:claimSource holds the endpoint as a string literal, and every unmarked quad authored inside the block is claimed against exactly that source.Copy as claim

A diagram may have zero or more source scopes alongside zero or one sdd:LocalScope, all reachable via sdd:hasScope — a diagram of only source scopes, with no local facts at all, is legal. Like every scope, a sdd:SourceScope is a coordinate frame (spec §3.2): without a position it is an identity frame relative to its parent, and an author may give it one with sdd:at. A sdd:SourceScope is the provenance unit of Plan 5's scene: which endpoint a claimed quad verifies against is decided by which source scope authored it, not by anything on the quad itself.Copy as claim