New Issue: WSP namespace - interoperability and forward compatibility (Metadata Spec)

The latest policy domain specifications (WS-TX, WS-RX and WS-SX) are 
moving towards a model where the assertions are valid within  WS-Policy 
1.2 (https://schemas.xmlsoap.org/ws/2004/09/policy/) *OR* WS-Policy 1.5 
(https://www.w3.org/ns/ws-policy/) attachments.
For example, take a look at the latest ReliableMessaging policy here: 
https://docs.oasis-open.org/ws-rx/wsrmp/200702. 
Section 1.4 of the RM spec at the above location states:
"The assertions defined within this specification have been designed to 
work independently of a specific version of WS-Policy.  At the time of the 
publication of this specification the versions of WS-Policy known to 
correctly compose with this specification are WS-Policy 1.2 and 1.5. 
Within this specification the use of the namespace prefix wsp refers 
generically to the WS-Policy namespace, not a specific version."
Could we consider something similar in the WS-Addressing metadata spec? 
This would mean similar text in the namespace section of the spec and 
removing direct references to WS-Policy 1.5 (e.g. in the first sentence of 
section 3.1)   This will alleviate potential forward compatibility issues 
as well as allowing for current backward compatibility with WS-Policy 1.2.
Katy
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