XPath support: define in spec or in profile?

[Gary P Cole <Gary.P.Cole@Sun.COM>]

The SPMLv2 protocol is rather generic, in that it is intended to support 
at least two bindings (SPML 1.0 or "DSML profile" and XML Schema or "XSD 
profile"). 

As I understand it, the requirement that a provider support XPath 
expressions (as well as any limitation to that required support) applies 
only to the XSD profile.

1) Do others agree?  What of other possible profiles, such as (for 
example) an HR-XML profile?

2) If XPath support applies only to the XSD profile, should the main 
spec define the requirement for XPath support? Or should the main spec 
simply mention XPath as one *example* of a language in which a value of 
SelectType#path might be expressed?

Gary