sparqdown-graph namespace
The sdg: namespace is the registry's vocabulary. It covers the document classes the registry recognises (sdg:SparqdownDocument, sdg:TypeDefinition, sdg:LabelDefinition, sdg:MetadataDefinition, sdg:NamespaceDefinition, sdg:Anthology, sdg:HookDefinition), topology and lineage predicates (sdg:supersedes, sdg:latestVersion, sdg:dependsOn, sdg:hasLabel, the reified sdg:Dependency arc and its status values), hook and policy vocabulary, and Constellation-of-Graphs declarations (sdg:ConstellationGraph, sdg:adapterKind, sdg:endpoint, sdg:dependencyDiscoveryQuery).
Membership in this namespace is derived by the Lexicon from the declaration above — see Namespace Definition.