Re: Problem evaluating XPath expression into a NodeList

Tod,

  It seems that you want the 'summary' elements and not their content  
(as they may be empty). Drop the "/text()" from the end of your XPath  
expression.

  Hope this helps.

-- Santiago

On Oct 22, 2009, at 7:53 AM, Tod wrote:

> On 10/21/2009 3:34 PM, [email protected] wrote:
>>  Insufficient data. What does the input document look like and what  
>> is your XPath?
>> Tod <[email protected]> wrote on 10/21/2009 02:00:02 PM:
>> > Tod <[email protected]>
>> > 10/21/2009 02:00 PM
>> >
>> > To
>> >
>> > [email protected]
>> >
>> > cc
>> >
>> > Subject
>> >
>> > Problem evaluating XPath expression into a NodeList
>> >
>> > I have a class that evaluates an XPath expression against an XML  
>> stream
>> > with multiple namespaces and returns a NodeList.  I know by  
>> looking at
>> > the XML that the node I am retrieving is composed of 20 elements,  
>> called
>> > '<summary>'.  I also know that two of those elements have no  
>> value.  The
>> > relevant code looks like this:
>> >
>> >
>> >    XML2Doc xmldoc = new XML2Doc(getXmlFile());
>> >    Document domTree = (Document) xmldoc.getDoc();
>> >    domTree.getDocumentElement().normalize();
>> >    NamespaceResolver myResolver = new NamespaceResolver();
>> >    XObject xObj = XPathAPI.eval(domTree,getXpathExp(),myResolver);
>> >    NodeList = xObj.nodelist();
>> >
>> >
>> >
>> >
>> >
>> > The problem I am running into is that of the 20 <summary>  
>> elements some
>> > are empty (<summary type="html"></summary>).  Upon evaluating the  
>> XPath
>> > expression the NodeList returned only 18 items event though I  
>> know there
>> > are twenty.  It seems that the elements that weren't valued became
>> > insignificant as the NodeList was generated.
>> >
>> > Is this the correct behavior?  I'm expecting my NodeList to have  
>> the
>> > same number of <summary> elements because I'll be matching them  
>> against
>> > their related <title> elements during presentation time.  Perhaps  
>> there
>> > is something I need to do in my code to establish the fact that  
>> empty
>> > elements are significant and should be included in the NodeList?  I
>> > tried removing the normalize() call but that didn't help.
>> >
>> > To make things more interesting I am developing this code using JDK
>> > 1.4.2 because that it is the development environment the customer  
>> is
>> > using and requires.
>> >
>> >
>> > Thanks - Tod
>> >
>
>
>
> AtomXML - http://tools.ietf.org/html/rfc4287, with a couple of extra  
> namespace definitions thrown in.  On page two of the RFC there is an  
> example.  To demonstrate the problem I'm running into just remove  
> the string "Some text." from the example XML.
>
> You may be familiar with the XML document format as it is the format  
> returned by the IBM Omnifind Yahoo! Edition enterprise search.
>
> My XPath expression is:
>
> /default:feed/default:entry/default:summary/text()
>
> Where 'default' is the AtomXML namespace "http://www.w3.org/2005/ 
> Atom".
>
>
>
> Thanks - Tod