XPathAPI: eval exp using nodes with default namespace 2006-09-12 - By Karr, David
For a self-update, I tried implementing a PrefixResolver implementation.
This gets me closer, but I'm still having trouble with the elements I'm
using the default namespace for. In this class, I map the prefix
"soapenv" to the SOAP namespace, and the empty string to my default
namespace. With this, expressions referencing only the "soapenv" prefix
work fine. However, expressions trying to use the default namespace
fail with:
"A node test that matches either NCName:* or QName was
expected."
Which basically means there was some sort of syntax error.
I tried a variation of changing the empty prefix to a non-empty prefix,
just in the prefix map and in my xpath expression (not in the message to
parse). This doesn't fail, it just doesn't match anything :) .
> -----Original Message-----
> From: Karr, David
> Sent: Tuesday, September 12, 2006 1:10 PM
> To: xalan-j-users@(protected)
> Subject: XPathAPI: eval exp using nodes with default namespace
>
> Xalan 2.7.0, JDK 1.4.2, WebLogic 8.1.4.
>
> I'm trying to write xpath validation expressions for the
> following SOAP message (slightly edited). I could use some
> help understanding what I'm seeing here, and how to make this
> work well.
>
> ----------------
> <?xml version="1.0" encoding="utf-8" standalone="yes"?>
> <soapenv:Envelope
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>
> xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
> <soapenv:Body>
> <ReportResponse xmlns="http://...">
> <ReportUrl>https://.../Test%20Portfolio.csv</ReportUrl>
> <Warnings/><Errors/>
> </ReportResponse>
> </soapenv:Body>
> </soapenv:Envelope>
> ----------------
>
> I'm processing this with code like this:
>
> ----------------
> SOAPPart soapPart = message.getSOAPPart();
> Source xmlSource = soapPart.getContent();
> TransformerFactory transformerFactory > TransformerFactory.newInstance(
);
> Transformer transformer = transformerFactory.newTransformer();
> DOMResult domResult = new DOMResult();
> transformer.transform(xmlSource, domResult);
> Node node = domResult.getNode();
> System.out.println("node[" + node + "]");
>
> Element documentElement = ((Document) node).getDocumentElement();
>
> for (Iterator iter = xpathStrs.iterator(); iter.hasNext(); )
> {
> String xpathStr = (String) iter.next();
> XObject object = XPathAPI.eval(documentElement, xpathStr, node);
> System.out.println("object[" + object + "]");
> }
> ----------------
>
> When I evaluate this expression: /soapenv:Envelope
>
> It fails, saying that "soapenv" must resolve to a namespace.
>
> I then tried instead: /env:Envelope
>
> This works (the Xobject is not null). I'm not sure why this
> works, and the other one does not.
>
> Next, I tried the expression: /env:Envelope/env:Body/ReportResponse
>
> This fails. I'm guessing it has something to do with the
> fact that I'm trying to use the default namespace, but I
> think referencing no prefix in Xpath means to use "no
> namespace", which isn't the same thing.
>
> What's going on here, and what do I need to do differently?
>
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