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Namespace Nodes, was RE: XPath Transform, 3rd version

From: John Boyer <jboyer@PureEdge.com>
Date: Tue, 11 Apr 2000 09:40:07 -0700
To: "TAMURA Kent" <kent@trl.ibm.co.jp>, "'IETF/W3C XML-DSig WG \(E-mail\)'" <w3c-ietf-xmldsig@w3.org>
Message-ID: <BFEDKCINEPLBDLODCODKGEFJCCAA.jboyer@PureEdge.com>
Hi TAMURA-san,

In section 5.4 of the XPath spec, the namespace URI for all namespace nodes
is declared to be NULL, so the comparison as defined always works (the
primary key is always the same).

Another way to put this is that I intend option A below.  I haven't seen
option B used elsewhere, and I don't think there would be any benefit in
deriving one here.

Thanks,
John Boyer
Software Development Manager
PureEdge Solutions, Inc. (formerly UWI.Com)
Creating Binding E-Commerce
jboyer@PureEdge.com



-----Original Message-----
From: w3c-ietf-xmldsig-request@w3.org
[mailto:w3c-ietf-xmldsig-request@w3.org]On Behalf Of TAMURA Kent
Sent: Monday, April 10, 2000 8:42 PM
To: 'IETF/W3C XML-DSig WG (E-mail)'
Subject: Re: XPath Transform, 3rd version



In message "XPath Transform, 3rd version"
    on 00/04/06, "John Boyer" <jboyer@PureEdge.com> writes:
> TAMURA-san: You posted a question about order of namespace nodes.  The
> paragraph about serializing the namespace and attribute axes states that
the
> primary key for lex order of nodes on these axes is the namespace URI, so
I
> don't know what the problem is.  Do you see a problem with using namespace
> URI (e.g. are you thinking we need to always add the default definition
for
> xmlns to the initial evaluation context)?

A namespace declaration has no namespace, that is to say, there
is no namespace binding on "xmlns" prefix.  A URI as the value
of a namespace declaration is not its namespace.  So, there are
two interpretations:

  a) Namespace declaration has no namespace URI.  The primary
  key is empty.  The secondary key is a local name (the declared
  prefix.)

  b) Regards the value of a namespace declaration as namespace
  URI.  The primary key is the URI.  The secondary key is a
  localname (the declared prefix.)

--
TAMURA Kent @ Tokyo Research Laboratory, IBM
Received on Tuesday, 11 April 2000 12:31:14 GMT

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