hXML: the XML Microformat

One of the difficulties I've had with Microformats is that there has to be a custom binding for every XML vocabulary into the microformat. I wonder if it's possible to have a generic binding of XML into HTML. Obviously there would need to be many constraints. But it seems like it ought to be some fairly generic rules for mapping one tree structure into another. We've already done one of them in the WSDL 2.0 HTTP binding, which maps an XML structure into a URI. The URI structure is a bit less expressive than HTML as you can't do things like multiple siblings (URI is single tree via /es), so that seems to bode well. One thing for me to take a look at in the copious spare time..