Uche, I have it working now. Thanks for your help!
Yours, JonTom
JT Kittredge
ITA Software, Inc.
Cambridge, Massachusetts
On 2005-06-13 at 09:33, Uche Ogbuji wrote:
> On Mon, 2005-06-13 at 10:29 -0400, JonTom Kittredge wrote:
> > Uche, Thanks for your response. My comments are below.
>
> > On 2005-06-09 at 06:26, Uche Ogbuji wrote:
> > > On Wed, 2005-06-08 at 10:27 -0400, JonTom Kittredge wrote:
> > > > I'm having trouble using PyXML to evaluate XPath expressions that
> > > > include namespace references.
> > > >
> > > > Here is a sample Python snipped:
> > > >
> > > > #!/usr/bin/env pystart
> > > >
> > > > import sys
> > > > import xml.dom.minidom
> > > >
> > > > from xml.xpath.Context import Context
> > > > from xml.xpath import Evaluate
> > > > from xml.xpath.NamespaceNode import NamespaceNode
> > > >
> > > >
> > > > if __name__ == "__main__":
> > > > sys.stderr.write("XPathTest: 18\n")
> > > >
> > > > inputDom = xml.dom.minidom.parse(open("xpathtest-input.xml"))
> > > >
> > > > sys.stderr.write("Node: %s\n" % (inputDom.documentElement))
> > > > outContext = Context(inputDom.documentElement)
> > >
> > > Where are you passing in the NS mapping here? Did I miss a PyXML XPath
> > > update that defaults mappings to in-scope namespaces on the node passed
> > > in?
> >
> > That's the nub of my question. How do I pass namespace mappings into
> > Evaluate()?
>
> outContext = Context(inputDom.documentElement, processorNss={u'dbq':
> DBQNS})
>
> > The only thing I could see to try, from looking at the documentation,
> > was to use the context argument. The Context object holds namespace
> > objects, so I thought that that might be the way to pass in my
> > definition.
>
> Yes, but you have to give it the namespace defs, as above.
>
> > As you can see from the output, the Context I get from the document
> > node already has the "dbq" namespace defined (since it appears in the
> > input), before I call Evaluate(). However, it apparently gets reset
> > during the call to Evaluate().
>
> That's what's confusing me. I'm not sure why it automatically has that
> namespace at any point. Anyway, see if my suggestion helps.
>
>
> --
> Uche Ogbuji Fourthought, Inc.
> http://uche.ogbuji.net http://fourthought.com
> http://copia.ogbuji.net http://4Suite.org
> Use CSS to display XML, part 2 -
> http://www-128.ibm.com/developerworks/edu/x-dw-x-xmlcss2-i.html
> XML Output with 4Suite & Amara -
> http://www.xml.com/pub/a/2005/04/20/py-xml.html
> Use XSLT to prepare XML for import into OpenOffice Calc -
> http://www.ibm.com/developerworks/xml/library/x-oocalc/
> Schema standardization for top-down semantic transparency -
> http://www-128.ibm.com/developerworks/xml/library/x-think31.html
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