Using dynamic href in XSLT import/include?

Question

The and elements seem to behave quite specific. What I am trying to do:

Answer 1

What I am trying to do:

This isn't allowed in any version (1.0, 2.0, or 3.0) of XSLT.

In XSLT 2.0 (and up) one may use the use-when attribute, but the conditions that may be specified are very limited.

One non-XSLT solution is to load the importing XSLT stylesheet as an XmlDocument and use the DOM API to set href attribute to the really wanted value -- only then invoke the transformation.