Joint protocols

Hi,

Since I understand Web Intents may be taking up protocol registration 
(is that definitive?), I'd like to ask whether the concept of a joint 
would be feasible...

By this I mean suggesting a formalized means of allowing two independent 
protocols to co-exist within the same URI, or at least to allow one 
protocol to include other protocols with the same reuse of conventions.

My use case is to allow for a standard means of specifying styling 
information in a bookmarkable manner, while allowing the retrieval 
protocols to differ. For example, a link might state:

web+pipeline:someBook.html?css-include=div#chapter1&stylesheet=style.xsl&*rules=p{color:blue};*{font-size:x-large}*

...while another protocol could utilize the same styling approach

     isbn-lookup:1231231230?*rules=p{color:blue};*****{font-size:x-large}*

Maybe this reuse can be done as needed, but I wonder whether now might 
be the time to consider such possibilities.

Best wishes,
Brett