LC issue (part2): message exchange context out of nowhere?

Part 2
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Message Exchange Context

The notion of Message Exchange Context (MEC) is central to the
Binding Framework. However:

   * No formal definition for it is given in the glossary. There
     is only a vague description for it in part 2, section 5.1.2.
   * No real indication is given as to how a MEC is initialized
     or, possibly, transferred. For example, how does a SOAP node
     determine it should instantiate
     "context:ExchangePatternName" to
     "http://www.w3.org/2002/06/soap/mep/request-response/" and
     not to something else? IMO, part 2 should be explicit,
     either saying this is implementation specific, or providing
     a standard means for indicating, for example, the features
     being used.

Regards,

Jean-Jacques.