How can the PSVI be accessed in XSLT3 ?
In particular, the
dm:type-name<https://www.w3.org/TR/xpath-datamodel-30/#dm-type-name> of
elements and attributes.
Ideally also facets of their schema type.

I've searched the web, and reviewed the relevant specs:
https://www.w3.org/TR/xslt-30/ ,
https://www.w3.org/TR/xpath-31/
https://www.w3.org/TR/xpath-datamodel-31/
https://www.w3.org/TR/xpath-functions-31/
https://www.w3.org/Submission/xmlschema-api/xml-schema-api.html

Cheers,
Jason Polis