RE: MESSAGING STRAWMAN [4 of 5] ENROLL

[Peter Furniss <peter.furniss@choreology.com>]

ENROLL


- target address
	address
- atom identifier
	identifier
- reply address
	address
- participant address
	address
- participant identifier
	identifier
- qualifiers
	list of qualifiers

<btp:enroll>
  <btp:qualifiers>
    <foo:some-qualifier ...>...</foo:some-qualifier>
    <bar:another-qualifier ...>...</bar:another-qualifier>
  </btp:qualifiers>
  <btp:target-address>
    ...address...
  </btp:target-address>
  <btp:atom-identifier>...URI...</btp:atom-identifier>
  <btp:reply-address>
    ...address...
  </btp:reply-address>
  <btp:participant-address>
    ...address...
  </btp:participant-address>
  <btp:participant-identifier>...URI...</btp:participant-identifier>
</btp:enroll>


-->   reorder elements to
	target address, atom-identifer, participant address, participant identifer,
qualifiers


--> have marker to say do/do not want ENROLLED reply

absence of reply-address means use participant-address as reply-address.