[Laszlo-dev] Anyone know how to set an ant property from an xpath expression? Or where to find javax.xml.xpath.XPath?

[P T Withington]

I have a nifty table of OL versions:

<?xml version="1.0" encoding="utf-8"?>
<versions>
  <branch url="http://svn.openlaszlo.org/openlaszlo/trunk";>
    <entry revision="15440" release="Latest" id="4.8.ptw" />
  </branch>
  <branch url="http://svn.openlaszlo.org/openlaszlo/branches/4.6";>
    <entry revision="14738" release="Production" id="4.6.0" />
    <entry revision="14744" release="RC" id="4.6.1" />
    <entry revision="14781" release="Production" id="4.6.1" />
    <entry revision="14814" release="RC" id="4.6.2" />
    <entry revision="14827" release="Production" id="4.6.2" />
    <entry revision="14913" release="RC" id="4.6.3" />
  </branch>
  <branch url="http://svn.openlaszlo.org/openlaszlo/branches/4.7";>
    <entry revision="15428" release="RC" id="4.7.0" />
  </branch>
</versions>

And I can get the url and revision from svn info.  So I want to be able to look 
up the release and id with:

/versions/bran...@url='${svninfo.entry(url)}']/ent...@revision&lt;${svninfo.entry.commit(revision)}][last()]...@release]
/versions/bran...@url='${svninfo.entry(url)}']/ent...@revision&lt;${svninfo.entry.commit(revision)}][last()]...@id]

I found a nifty script:

    <scriptdef name="xpath-query" language="javascript">
        <attribute name="query"/>
        <attribute name="xmlfile"/>
        <attribute name="addproperty"/>

        <![CDATA[
            importClass(java.io.FileInputStream);
            importClass(javax.xml.xpath.XPath);
            importClass(javax.xml.xpath.XPathConstants);
            importClass(javax.xml.xpath.XPathFactory);
            importClass(org.xml.sax.InputSource);

            var exp = attributes.get("query");
            var filename = attributes.get("xmlfile");
            var input = new InputSource(new FileInputStream(filename));
            var xpath = XPathFactory.newInstance().newXPath();
            var value = xpath.evaluate(exp, input, XPathConstants.STRING);

            self.project.setProperty( attributes.get("addproperty"), value );

        ]]>

    </scriptdef>

But ant tells me it knows nothing about `javax`.  Help?