[ebxml-dev] ebMS MSH and routing

["Anarkat, Dipan" <DAnarkat@uc-council.org>]

Hi,
    I am trying to uderstand how the 

#1.     eb:MessageHeader/eb:PartyId
#2.     eb:MessageHeader/eb:PartyId/@eb:type

entities are used in the routing process for an ebMS message .

The specification says that the value of #2 has to be agreed upon b/w the
'ToParty' and the 'FromParty'.
How does this ensure message delivery in a multi-hop scenario with
intermediaries ?

Drawing an analogy with the IP addressing and routing scheme :
	# should'nt there be a standard for the value contained in #2 so
that the message can be interpreted and routed to the appropriate MSH / SOAP
node ?
	# can an ebMS MSH node be mapped to multiple 'PartyId' 's , similiar
to an multi-homed IP node with multiple IP addresses ?
	# shouldnt there be a naming / registry system like DNS for mapping
'PartyId' 's  to MSH nodes ?
	# how does an MSH node know the physical location ( IP address ) of
the next MSH ?

The spec recommends  that the the value of #2 be standard codes taken from
EDIRA (ISO6523), EDIFACT ISO 9735 or ANSI ASC X12 I05 registries. Can
someone explain how this facilitates ebMS messaging ? A few examples with
actual codes for the above would be helpful .



<eb:MessageHeader>
	<eb:To>
		<eb:PartyId eb:type="GLN">0614141000012</eb:PartyId>
	</eb:To>
	<eb:From>
		<eb:PartyId eb:type="DUNS">0060189737810</eb:PartyId>
	</eb:From>
</eb:MessageHeader>

Considering the example above in an multi-hop scenario, 
	# how are the values contained in #1 and #2 used by the 'ToParty'
and intermediary MSH nodes actually used for routing ?
	# how does an intermediary MSH node select the next MSH node and
consequently its physical (IP) location based on #1 and #2 ?
	# Couldnt there be a situation that an intermediary MSH may not
understand the value contained in #2 as #2 is not constrained by the
specification ?How does the routing work then ?

The specification also specifies that if #2 is not used , then the content
of #1 should ne a URI. In that case how does routing take place if the
content of #1 is say :
       	#URL :    <eb:PartyId >http://www.mycompany.com/service/Order
</eb:PartyId>
       	#email :    <eb:PartyId >mailto:somebody@mycompany.com </eb:PartyId>

Thanks

Dipan Anarkat
EC Systems Analyst
Uniform Code Council, Inc.
Tel: (609)-620-4509
http://www.uc-council.org/