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Why is Except limited to local fragments?

From: Joseph Reagle <reagle@w3.org>
Date: Wed, 27 Feb 2002 16:53:58 -0500
Message-Id: <200202272153.QAA25285@tux.w3.org>
To: imamu@jp.ibm.com, maruyama@jp.ibm.com
Cc: xml-encryption@w3.org

I was just rereviewing [1] while getting it ready for CR publication and 
had a substantive question: why must the Except URI's be "same document URI 
references"? The schema says anyURI and this doesn't permit one to use a 
detached signature...? (Maybe this has already been covered, but if so, I 
forgot the reason! <smile/>)

[1] http://www.w3.org/Encryption/2001/Drafts/xmlenc-decrypt.html#transform
The REQUIRED URI attribute value of the dcrpt:Except element MUST be a 
non-empty same-document URI reference [URI] (i.e., a number sign ('#') 
character followed by an XPointer expression (as profiled by 
[XML-Signature, Section]) and identify an enc:EncryptedData. 


Joseph Reagle Jr.                 http://www.w3.org/People/Reagle/
W3C Policy Analyst                mailto:reagle@w3.org
IETF/W3C XML-Signature Co-Chair   http://www.w3.org/Signature/
W3C XML Encryption Chair          http://www.w3.org/Encryption/2001/
Received on Wednesday, 27 February 2002 16:54:04 UTC

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