The Use of Language
Compare uses of Language Tags with presence of bf:descriptionLanguage, and also possible interpretations of language of a Work or Concept for determining language of plain strings in the title or prefLabel.
Extended Literals (SKOS-XL) as Structured Values
To represent transliterated forms. To be decided.
Literals and Structured Values
.. Error-correct untyped strings (vs. keeping differently cast terms in JSON-LD)
.. Soft-match partial datatype values (dates...
.. turn into rdf:value + :year, :month, :day? (as "virtual" properties of a Datatype) .. Shrink to Datatype Literals
.. Interpret Labels and Annotations (c.f. schema:PropertyValue)