W3C home > Mailing lists > Public > public-ws-addressing@w3.org > January 2005

Re: i043 comparison of refps

From: Rich Salz <rsalz@datapower.com>
Date: Tue, 25 Jan 2005 23:31:09 -0500 (EST)
To: public-ws-addressing@w3.org
Message-ID: <Pine.LNX.4.44L0.0501252324270.4673-100000@smtp.datapower.com>

>I think that provided the EPR doesn't contain any QNames (or other
>lexical forms that use namespace declarations) in content then EXCC14N
>is fine.

In particular, exc-c14n with an empty "included prefixes" list.

The caveat ("provided that") can't be treated lightly, since there are
many specs which use qnames in content, including things like xpath, xslt,
and (gee, didn't i try to fix this? :), ws-addressing.  we'll need to
explain that unless the comparator has the XSD definition for the EPRs
being compared (or the equivalent out of band information), it is quite
possible to get false negatives, since content of foo:bar and baz:bar can
either be the same or not, depending on whether or not they're known to be


Rich Salz                  Chief Security Architect
DataPower Technology       http://www.datapower.com
XS40 XML Security Gateway  http://www.datapower.com/products/xs40.html
XML Security Overview      http://www.datapower.com/xmldev/xmlsecurity.html
Received on Wednesday, 26 January 2005 04:31:13 UTC

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