sdd:atCopy as claim

sdd:at is the position of a scene instance relative to its parent frame, an sdd:vector literal such as "340 120"^^sdd:vector. It is the one position predicate shared by sdd:Node instances, sdd:LocalScope and other scopes, and groups alike — an earlier sdd:origin predicate was retired in favor of this single uniform reading (examples decision 11).Copy as claim

Every scope and group is a coordinate frame: without an sdd:at it is an identity frame relative to its parent, and with one its children's positions shift along with it. sdd:at is an aesthetic quad, machine-materialized cache by default and rewritten on recompute unless the author pins it with !, which serializes as an sdd:pinned annotation on that quad.Copy as claim