There's actually quite a lot of XML/XSLT support in various proprietary databases (eg RDF databases), and there's Postgres support too: https://www.postgresql.

There's actually quite a lot of XML/XSLT support in various proprietary databases (eg RDF databases), and there's Postgres support too: https://www.postgresql.org/docs/current/functions-xml.html https://www.postgresql.org/docs/current/functions-xml.html Iirc XML support in Postgres predates JSON support.