Jim, It works for me. The context web server is here http://entroplet.com/ . This doesn't use any XSLT. The XML is RDF.
It seems to me that if category theory is to be applied for managing a graph database of knowledge, one must first do the baby-steps of using the ideas of the semantic web ala Berners-Lee and conventional ontologies first. Triple store beats relational and it is in combat with free-form (i.e. google-like search engines ) . I am not even sure how category theory plays in to this spectrum.