[Specs-cx] Exact meaning of /Contract/Party/URL

[nara hideki]

Hi,all

I think we should define the meaning of /Contract/Party/URL element
more precisely.

1. for OP

This may be easy to define.  If someone discovery this URL,  the OP
should return a XRDS/XDS
which include the CX service endpoint used for this Contract as far as
the contract is
effective and in the term of validity.

The certificate used for HTTPS connection seems to be equal to the one
used for singing
the Contract XML.

2. for RP

The RP also should  return the XRDS/XRD describe himself.
The certificate used for HTTPS connection also seems to be equal to
the one used for singing
the Contract(Proposal) XML.

3. for End User(s)

I think this is URL(XRI) of the End User who accepted the contract. So
this should be the
OP local identifier which could be a PPID ( pairwise pseudo identifier).
This should return the XRDS/XRD describing the End User.
If he is the signer,  the public key should be while-listed or
registered at the proposing party.

Any suggestions  please.
----
hdknr