sparqdown-diagrams namespace
The sdd: namespace is the drawing standard of Sparqdown diagrams (design spec §5): the scene ontology (sdd:Node, sdd:Edge, sdd:Datum, scopes), the aesthetic predicates (sdd:at, sdd:size, sdd:shape, sdd:style), the grounding predicates (sdd:depicts, sdd:binds, sdd:value), and the literal datatypes (sdd:vector, sdd:anchor, sdd:path, sdd:route). It is frozen as part of the language: the vocabulary, its DSL surface, and the deterministic SVG projection version together.
The current inventory is the Plan-2 slice (the Example-1 subset), the Plan-4 sections/ports slice: sections (sdd:Section, sdd:flow, sdd:order, sdd:weight, sdd:rebinds, sdd:length), ports (sdd:Port, sdd:direction, sdd:in/`sdd:out`/`sdd:io`), and the sdd:fill aesthetic token — plus the Plan-5 sources/groups slice: scopes (sdd:SourceScope, alongside the reused sdd:LocalScope/`sdd:hasScope`) and groups (sdd:Group) with their intents (sdd:intent, sdd:AllChildren, sdd:Selection, sdd:of, sdd:via, sdd:select, sdd:subject), tweak records (sdd:Suppression, sdd:suppresses, sdd:replaces, sdd:suppressed, sdd:displayed), and edge routing (the dual-role sdd:route — precedented by sdd:anchor — and sdd:corners).
Membership in this namespace is derived by the Lexicon from the declaration above — see Namespace Definition.