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Re: removing/adding xmlns:xxx attributes

From: James Sulak <jsulak@gmail.com>
Date: Tue, 4 May 2010 11:54:01 -0500
Message-ID: <l2g7cb78b3b1005040954l9e52b846ie49f46b7df15d55d@mail.gmail.com>
To: "HILLMAN, Tomos" <tomos.hillman@oup.com>
Cc: "xproc-dev@w3.org" <xproc-dev@w3.org>
Hi Tom,

Namespace cleanup is hard, especially when DTDs are involved.

My technical understanding of namespaces isn't the best, but I think
the root of the problem is that DTDs don't support namespaces
properly.  (For way too much detail, see [1].)  In an ideal world, DTD
validation wouldn't treat xmlns attributes as "real" attributes, and
you wouldn't have a problem.

That said, it seems like it should be valid to specifically add (with
p:add-attribute) or match/delete (with p:delete) namespace declaration
attributes.  From the namespace spec [2]:

"The prefix xmlns is used only to declare namespace bindings and is by
definition bound to the namespace name http://www.w3.org/2000/xmlns/.
It MUST NOT be declared . Other prefixes MUST NOT be bound to this
namespace name, and it MUST NOT be declared as the default namespace.
Element names MUST NOT have the prefix xmlns."

So if xmlns is implicitly bound to http://www.w3.org/2000/xmlns/, I
would think that you could use the xmlns prefix to match the
attributes.  In that case, it would be a bug in the processor that you
can't.  But I'll leave it to more knowledgeable folks to tell me that
I'm wrong :)

[1] http://www.rpbourret.com/xml/NamespacesFAQ.htm#dtd_6
[2] http://www.w3.org/TR/REC-xml-names/

-James



On Tue, May 4, 2010 at 11:09 AM, HILLMAN, Tomos <tomos.hillman@oup.com> wrote:
> Hi List,
>
> I'm wondering if anyone has a solution to the following problem:
>
> I'm writing a chunking script that takes one large document and filters out particular 'chunks' - say //div1.  The document needs to be valid against a declared DTD.
>
> The root element of the original document has an xmlns:law attribute declaration for <law:extract> elements; these may also occur multiple times within each 'chunk'.
>
> Unfortunately, although the xmlns:law attribute is allowed both on the original root element and the law:extract element, it is not allowed on the filtered elements by the DTD: however, this is where my xproc processor (calabash under oxygen) adds them.
>
> How should I go about removing these attributes from the div1 elements and add them to the law:extract elements?  Trying to treat the elements as simple attributes gives errors like 'xmlns namespace not declared'...
>
> Help!
> Tom
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Received on Tuesday, 4 May 2010 16:54:55 GMT

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