original namespace mapping

Hi everyone,
  Is there a way to retrieve the document-specified mapping between
user namespace prefixes and the resolve URIs for those prefixes?  It
looks like this information is lost once ssax:xml->sxml finishes, and
the only way to obtain that *NAMESPACE* member of the resulting S-expr
is to specify the namespace mapping yourself.  That is, if I have a
document like:

<foo xmlns:myPrefix="http://www.w3c.org/">
  <myPrefix:special-element>Hello!</myPrefix:special-element>
</foo>

...I'd like to be able to access the mapping between myPrefix and
"http://www.w3c.org/".  I realize that the XML Namespace specification
encourages applications to use only the resolved URI once parsing is
complete, but where does that leave me if I've got to do
post-processing on data that only specifies the prefix that the
original document used?  In a case like this:

<document xmlns:after="http://post.processing.specification/">
  <after:oldNode value="hello"/>
  <addNodeInstruction namespace="after" name="newNode" value="goodbye"/>
</document> 

...my application has no way of knowing, for example, that oldNode and
the soon-to-be-inserted newNode come from the same namespace.  Any
suggestions?


Thanks,
Julian


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