NEW ISSUE 3966: Inconsistency in Primer re: PolicyReference Extensibility

NEW ISSUE 3966: http://www.w3.org/Bugs/Public/show_bug.cgi?id=3966

Title: Inconsistency in Primer re: PolicyReference Extensibility
Target: Primer
Description:

In Section 3.7, Primer, only attribute extensibility is specified for
PolicyReference element. This is inconsistent with Section 4.3.4 of the
WS-PolicyFramework that allows both element and attribute extensibility for
this element.

Justification: See Description.

Proposal: 
Primer, Section 3.7: 
(current) "The PolicyReference element allows attribute extensibility."

WS-Policy Framework, Section 4.3.4:
  /wsp:PolicyReference/{any}
   "Additional elements MAY be specified but MUST NOT contradict the
   semantics of the [parent element]; if an element is not recognized,
   it SHOULD be ignored."

Suggested Section 3.7, Primer:
(proposed) "The PolicyReference element allows element and attribute extensibility."