Stefan,
Below is copied and pasted from a Java class I use:
/**
Applying a technique suggested by James Strachan of dom4j.org
to overcome the
default namespace/XPath issue. XPath maps namespaces to
elements based upon
the namespaceURI, not the prefix in the source document. When
there is a default
prefix, i.e., "xmlns=<namespaceURI>", each non-prefixed element
STILL matches
the URI, but there is no prefix available for use in XPath
expressions. So we
tell XPath to map the same namespaceURI to a non-"" prefix,
which we then use
in our XPath expressions. XPath will match the URIs, and find
the non-prefixed
elements in the source document as a result.
Ex:
In source document:
<tgML
xmlns="http://www.aigtrading.com/tgML/2002/07";
>
<trade ID="309430320"/>
<.../>
</tgML>
By defining an XPath-only prefix, "tg" for the same namespace,
I can match:
elem.selectNodes("/tg:tgML/tg:trade/@ID")
to get the value of the ID attribute.
*/
public static Document getDom4jDocument (
String xml,
String xPathPrefix
) throws DocumentException
{
// register prefixes with my factory
Map uris = new HashMap();
// don't allow "default" prefix
if (xPathPrefix == null || xPathPrefix.equals(""))
xPathPrefix = "tg";
uris.put (xPathPrefix,
"http://www.aigtrading.com/tgML/2002/07";);
// create the actual Document
return getDocFromString (xml, uris);
}
/**
*
* @param xml String containing any form of XML for which a document
is desired, but without any
* namespace.
* @return org.dom4j.Document
* @throws org.dom4j.DocumentException
*/
public static Document getNoNamespaceDocument (String xml) throws
DocumentException
{
return getDocFromString (xml, null);
}
/**
*
* @param xml String containing any form of XML for which a document
is desired.
* @param uris List of URIs that will be used as namespace
attributes.
* @return org.dom4j.Document
* @throws org.dom4j.DocumentException
*/
protected static Document getDocFromString (String xml, Map uris)
throws DocumentException
{
// create my own factory
DocumentFactory factory = new DocumentFactory();
// maybe add namespace nodes
if (uris != null)
factory.setXPathNamespaceURIs (uris);
// create a string Reader wrapped around the String parameter
StringReader source = new StringReader (xml);
// now parse and return a document using my factory
SAXReader reader = new SAXReader();
reader.setDocumentFactory (factory);
return reader.read (source);
}
Stefan Lischke
<[EMAIL PROTECTED]> To:
Sent by: cc: [EMAIL PROTECTED]
[EMAIL PROTECTED] Subject: [dom4j-user] selectingNodes
with xpath and namespace
ceforge.net
11/21/2003 01:43 PM
Hi,
I want to select a singleNode by Xpath with
Node member =
this.e.selectSingleNode("/association/member[topicRef/@xlink:href='
#TMSWSS03']");
It worked, when there was no namespace xlink for the @href attribute,
but with xlink namespace it does not work.
How can i specifiy a namespace when selecting a single node.
this.e.asXML() is as follow:
-------------------------------------------------------------------------------------------------------------------
<association xmlns:exist="http://exist.sourceforge.net/NS/exist";
exist:id="[EMAIL PROTECTED]"
exist:source
="/db/xtm4xmldb/ivsData.xtm/assocs/[EMAIL PROTECTED]"
id="[EMAIL PROTECTED]">
<instanceOf>
<topicRef xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:href="ivsTypes.xtm#VERANSTALTET">
</topicRef>
</instanceOf>
<member>
<roleSpec>
<topicRef xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:href="ivsTypes.xtm#PERSON">
</topicRef>
</roleSpec>
<topicRef xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:href="[EMAIL PROTECTED]">
</topicRef>
</member>
<member>
<roleSpec>
<topicRef xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:href="ivsTypes.xtm#VERANSTALTUNG">
</topicRef>
</roleSpec>
<topicRef xmlns:xlink="http://www.w3.org/1999/xlink"; xlink:href="
#TMSWSS03">
</topicRef>
</member>
</association>
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