sdd:valueCopy as claim

sdd:value holds a sdd:Datum's materialized cache value — the value its sdd:binds path last resolved to, written into the document so rendering is offline-complete (spec §5, Tier 1: readers don't run SPARQL, just as they don't run a layout engine).Copy as claim

sdd:value is rewritten whenever the diagram recomputes, unless the quad is pinned: pinning materializes as an sdd:pinned annotation on that exact quad, the same "cache unless annotated" rule that governs every other scene and aesthetic quad (examples decision 2). A grounded datum's sdd:value is also what verification checks against the source — divergence between the cached value and a fresh query result is what a stale diagram looks like.Copy as claim