[ebxml-cppa] Re: wrt CPP version 2.0

[Martin W Sachs <mwsachs@us.ibm.com>]

Radika,

My responses to your questions are below.

Regards,
Marty Sachs

*************************************************************************************

Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com
*************************************************************************************


                                                                                                                            
                      Radhika Menon                                                                                         
                      <radikamenon@yaho        To:       ebxml-cppa-comment@lists.oasis-open.org                            
                      o.co.in>                 cc:                                                                          
                                               Subject:  wrt CPP version 2.0                                                
                      08/29/2002 05:33                                                                                      
                      AM                                                                                                    
                                                                                                                            
                                                                                                                            



Hi,

As am involved in providing implementation for CPP
version 2.0 specs, I would like to get clarification
on the following points emerged after going through
the CPP 2.0 specification.

1. what is the purpose of CanSend and CanReceive
elements in CPP.

MWS:  CanSend and CanReceive identify the delivery
channel to be used for sending and receiving the
messages for each action.  In general, an action
maps to a particular requesting or responding
business activity in the BPSS instance.

2. what is the significance of having the (0 or more
)CanReceive element as a child element of CanSend
element.

MWS: CanReceive is included as a child element of CanSend
to support synchronous responses. CanReceive provides
the necessary delivery channel information for receiving
the response message when this party is the sender
of the message in the requesting business activity..

3. what is the significance of having the (0 or more
)CanSend element as a child element of CanReceive
element.

MWS: CanSend is a child of CanReceive for synchronous
messages.  This is the case where this party is
sending the response message in the responding
business activity.

4. upto how many levels the CanSend or CanReceive
Elements can be recurring within itself.

MWS: For practical purposes, there is only one level
since a requesting or responding business activity
is only a single request and response pair. The
choreography is defined by the BPSS instance document.
The schema may not prohibit multiple levels but I
don't think there is a use case for more than one
level.

5. I do understand the purpose of ReliableMessaging
element and its child elements in the context of
ebXMLSenderBinding Element. I really don't understand
why is it required in case of ebXMLReceiverBinding
Element.

MWS:  Each delivery channel has to contain information
about both parties in order to ensure that their
messaging characteristics are compatible. That's why
both ebXMLSenderBinding and ebXMLReceiverBinding are
needed.  One simply example is that both parties
have certificates and the CPA has to identify whose
certificate is used in each security function. For
example, a sending Party has to encrypt using the
receiving Party's certificate so that the receiving
party can decrypt.

I would be glad if anyone of you can clear all my
doubts and provide with the necessary information.

Thanks in Advance.

with best regards,
radika.


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