core spec problem: Resolving references on Verify

[Trevor Perrin <trevp@trevp.net>]

The Basic Processing Algorithm for Verifying XML Signatures has a problem.

In 4.3.1, it says "For each <ds:Reference> in <ds:Signature>, the server 
finds the input document with matching RefURI and RefType values."

However, there may be multiple such input documents, with different 
<ds:Transform>s from the client-side.  Perhaps change the text to:

"""
For each <ds:Reference> in <ds:Signature>, the server looks for a 
matching input document.  An input document matches a <ds:Reference> if 
all of the following conditions hold:
  - The input document's RefURI attribute equals the <ds:Reference>'s 
URI attribute, or both attributes are missing.
  - The input document's RefType attribute equals the <ds:Reference>'s 
Type attribute, or both attributes are missing.
  - The N transforms specified by the input document's <ds:Transforms> 
element are identical to the first N transforms in the <ds:Reference>'s 
<ds:Transforms> element, and the server is capable of applying the 
subsequent transforms in the <ds:Reference>.  If the input document is 
missing a <ds:Transforms> element, set N = 0.
"""

Trevor