Communication means in draft-ietf-impp-cpim-pidf-05

Hi,

As defined in the PIDF I-D, the tuples in application/cpim-pidf+xml include communication address, which consists of communication means and contact address of the tuple. There is a corresponding XML element, the <contact> element, which contains a URL of the contact address. From the examples present in the draft one can make the assumption that the tuple id refers somehow to the communication mean, however the tuple id attribute is "only" used to distinguish one tuple from other tuples in the same XML document.

The question is that how can the watcher figure out from the example below what is the communication mean of the provided contact address. It could be "voice", "video", even "im", etc. 

 <tuple id="a67uyt76">
       <status>
         <basic>open</basic>
       </status>
       <contact priority="1.0">sip:[email protected]</contact>
     </tuple>

Thanks,
Krisztian




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