8201: Clarify required and optional operations

Ram,
  I think issue 8201 is a good idea.  Do you have a proposal for how you 
think this should look in the specs?  I see 2 options:
1 - in the "Compliance" section add a paragraph saying which ops are 
optional vs required
2 - at the top of each operation's section add a sentence stating which 
that operation is required or optional.

WS-Transfer has this in the compliance section:
A compliant SOAP Node that implements a resource MUST provide the Get 
operation as defined in this specification, and MAY provide the Put and 
Delete operations. 

While MEX say this in the GetMetadata section:
A service endpoint MAY support the GetMetadata request.

Either works but we should be consistent across all the specs.

thanks
-Doug
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