Re: [xml] SelectSingleNode

[Daniel Veillard <veillard redhat com>]

On Mon, May 02, 2011 at 03:47:04PM -0400, Paul B. Cameron wrote:
> In this particular case, however, I know how to format and register the
> namespace information before evaluating the query. The challenge is
> obtaining the set of namespaces declared by the instance document in the
> first place.

  Unfortunately the Microsoft API doesn't make much sense I'm afraid
(or I misunderstand it), because a namespace URI may be bound to
multiple prefixes on a document, and a given prefix may be bound to
different namespace on a given document. So asking at the document
level doesn't make sense to me.
  What you can do is ask for the list of namespaces in scope for
a given element, libxml2 has an aPI for this:
  http://xmlsoft.org/html/libxml-tree.html#xmlGetNsList

  Note that the namespace prefix used in an XPath query is not significant,
the XPath matching will be done only on th namespace name, never the prefix.

Daniel

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