Hi, Ahmed.
Ahmed Ashour <[EMAIL PROTECTED]> wrote on 2008-03-06 01:04:57 PM:
> 1- Xalan doesn't concatenate the text into one, but returns the text
> before CDATA only.
>
> javax.xml.xpath.XPathExpression expression = xpath.compile("
> /root/text()");
>
> org.w3c.dom.NodeList result = (NodeList) expression.
> evaluate(new org.xml.sax.InputSource("foo.xml"),
XPathConstants.NODESET);
> for( int i=0; i < result.getLength(); i++ ) {
> System.out.println(((Text) result.item(i)).
> getTextContent());//prints 'a' only, without CDATA or 'b'
> }
You didn't show how you created the JAXP XPathFactory in this, but I'm
assuming you created one that supports DOM as the object model - in fact,
that's the only model supported by Xalan-J's implementation of the JAXP
XPath API.
A DOM tree can have adjacent DOM Text nodes and DOM CDATA nodes, and
that's almost certainly what your DOM tree looks like in this case: a DOM
Element node named root, with three children, a DOM Text node with string
value "a", a DOM CDATA node with string value " CDATA " and a DOM Text
node with string value "b". But, as Joe and David have pointed out, the
XPath data model has to present a logical view in which a text node never
has a sibling that is another text node, so in XPath the three DOM nodes
are seen as a single XPath text node, with string value "a CDATA b".
When you return the result of /root/text() as a nodeset, what is returned
is the first DOM node of the three DOM Text nodes that comprise the
logical XPath text node.
> 2- I see the point raised in secion 5.7 of Xpath 1.0, but wonder why
> both Internet Explorer and Firefox do not behave accordingly, please
> find below:
>
> <html><head><title>foo</title><script>
> function test() {
> var text='<root>a<![CDATA[ CDATA ]]>b</root>';
> if (window.ActiveXObject) {
> var doc=new ActiveXObject('Microsoft.XMLDOM');
> doc.async=false;
> doc.loadXML(text);
> } else {
> var parser=new DOMParser();
> var doc=parser.parseFromString(text,'text/xml');
> }
> alert(doc.documentElement.childNodes.length);
> }
> </script></head><body onload='test()'>
> </body></html>
I'm a bit confused by this example. It doesn't look like you're working
with any XPath expression here, but with the DOM tree only, so you don't
get the opportunity to notice the discrepancy between DOM and the XPath
data model.
Thanks,
Henry
------------------------------------------------------------------
Henry Zongaro
XML Transformation & Query Development
IBM Toronto Lab T/L 313-6044; Phone +1 905 413-6044
mailto:[EMAIL PROTECTED]
