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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