sparqdown-lexicon namespace

The lex: namespace is the vocabulary the Lexicon graph materialises its term index in: lex:Term entries carrying lex:declaringDocument, lex:label, lex:tooltipSummary, lex:versionIri, and lex:documentClass, namespace membership via lex:Namespace, lex:inNamespace, and lex:preferredPrefix, coinage via lex:coins, and usage tracking via lex:referencedBy and lex:referencedByClass.

Membership in this namespace is derived by the Lexicon from the declaration above — see Namespace Definition.