mod_proxy_xml and multi-namespace xml files?

[Nick Burch <nick.burch@xxxxxxxxxxxx>]

Hi All

For a demo, I find myself needing to re-write some URLs in an atompub 
service document that's being proxied. I thought that mod_proxy_xml might 
be a good bet for this, but I'm having some issues.

Firstly, I took the mod_proxy_xml source code, and needed to edit it to 
add support for atompub, as it's not directly configurable. I defined the 
http://www.w3.org/2007/app namespace, then largely copied the XHTML 
definition to work for it, without initially any elt's defined. Initially, 
I've only defined the main http://www.w3.org/2007/app namespace, and not 
any of the others contained in my atompub document. Finally, I used a 
simple mod_filter set to pass the atompub mimetype to mod_proxy_xml, and 
used a XMLNSUseNamespace line to bind the app namespace to mod_proxy_xml

The problem is that the additional namespaces seem to be getting partly 
lost in the proxy process. For the following sample document:

  <?xml version="1.0" encoding="utf-8"?>
  <service xmlns="http://www.w3.org/2007/app";
           xmlns:example="http://www.example.com";
           xmlns:atom="http://www.w3.org/2005/Atom";>
   <workspace>
     <example:test />
     <example:test2>
       <example:link href="http://localhost:8080/somewhere"; />
     </example:test2>
   </workspace>
  </service>

The proxied form (with no re-writing enabled for atom, just processing it 
as-is through mod_proxy_xml) is:

  <?xml version="1.0" encoding="utf-8"?>
  <service xmlns="http://www.w3.org/2007/app";>
    <workspace>
      <example:test></example:test>
      <example:test2>
        <example:link href="http://localhost:8080/somewhere";></example:link>
      </example:test2>
    </workspace>
  </service>

As we can seem, the namespace definitions for atom: and example: have got 
lost. In my case, I will want to change URLs in some namespaces, but not 
all, and I may not know all the different namespaces that may be used.

Does anyone know what the trick is for not getting these additional 
namespaces lost? Is there an extra definition I need to add somewhere to 
have all of them preserved? Or is mod_proxy_xml limited to just handling 
documents with a single namespace?

Cheers
Nick

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