is there a way to include the output of an xml file that has been transformed by its associated xslt template into another xslt stylesheet when the latter one is called by an xml file?

What I mean is that the user opens whatever.xml --> whatever.xslt (<-- another.xslt <--another.xml).

Afaik xi:incude only works in xml files and nothing is transformed right?

Thank you for taking the time.