I wrote:
> > The OP didn't want to prefix the elements or the 
> attributes, he wanted
> > to add prefixes to the names appearing within XPath 
> expressions within
> > the content of the attributes. That clearly needs an XPath 
> > parser, which
> > makes it unlikely that anyone will offer a working solution.
> > 
> > Michael Kay
> 
> It was my impression that there were some open-source programs
> out there that used XPath parsers, e.g. XPath expression tracer/
> debuggers. Guess I'll look into that some more.

Another way to ask this is, has anyone had success hooking into
existing open-source XSLT processors like Xalan or Saxon that
include XPath parsers, or say the Perl XML::XPath module,
and adding custom functionality?
(Some other possibilities I've run across include SAXPath
[http://www.xmlhack.com/read.php?item=1321] and
4suite.)

Application 1: as described previously, the oft-needed requirement
to add namespace prefixes to element names in XPath expressions.

Application 2: to validate existing XPath expressions against
sample source documents in order to catch errors in the XPath
expressions.

Lars


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