[namedgraph]

I use it in ETL whenever I have an XML source, then I use XSLT to lift it to RDF (either RDF/XML or TriX). I use it for the UI where I'm transforming RDF/XML to HTML. I'm also using for the interactive parts instead of Javascript (or React or Svelte etc.), but that's the interactive XSLT extension that goes beyond the standard.

XML to XML, XML to RDF, JSON to XML and XML to JSON, XML to text -- XSLT can be used for all kinds of transformations. 3.0 also supports streaming transforms, which is very useful for large input files.

XSLT is a declarative DSL made specifically for the XML data model. It does limited things such as navigating the XML tree but does them really well. It lifts the abstraction level so you can focus on the transformation. You can transform XML with bash or a general purpose language like Java, but it will never be so concise or effective.