[jdom-interest] Problem with DOCTYPE and SAXBuilder

[Ewan Harrow]

I am new to JDOM but I am having a spot of difficulty getting any
children of the root element using a document created with SAXBuilder
and a particular DTD.  The xml below is from a JSP Taglib TLD.

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE JSPTAGLIB.1_1
        PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
	"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">

<taglib>
    <tlibversion>1.0</tlibversion>
    <jspversion>1.1</jspversion>
    <shortname>sample</shortname>
    <info>

Sample tag library template. 
Contains one sample tag with an attribute and a variable. 
  
    
    </info>
    
    <tag>
        <name>sample</name>
        <tagclass>pkg.SampleTag</tagclass>
        <bodycontent>JSP</bodycontent>
        <info>
A sample tag. 
        
        
        </info>
        
        <attribute>
            <name>sampleAttribute</name>
            <type>String</type>
            <rtexprvalue>true</rtexprvalue>
            <required>false</required>
        </attribute>

    </tag>

</taglib>


My code is as follows:

    ...
    SAXBuilder builder = new SAXBuilder();
    //DOMBuilder builder = new DOMBuilder();
    
    try {
      // Build the JDOM Document
      Document doc = builder.build(new File("taglib.tld"));
      //Document doc = builder.build(file);
      
      Element taglib = doc.getRootElement();
      System.out.println(taglib.getName());
      
      List tags = taglib.getChildren("tag");
      System.out.println("This TLD has "+ tags.size() +" tags:");
      Iterator i = tags.iterator();
      while (i.hasNext()) {
        Element tag = (Element) i.next();
        System.out.print("\t" + tag.getChild("name").getTextTrim() +
                          " for " +
tag.getChild("info").getTextTrim());
        List attributesList = tag.getChildren("attribute");
        System.out.println(" (it has " + attributes.size() + "
attributes)");
      }
    } catch (JDOMException ex) {
      System.out.println(ex);
    }

The expected output should be:

taglib
This TLD has 1 tags:
        sample for A sample tag. (it has 0 attributes)

Instead I get:
 
taglib
This TLD has 0 tags:


I switched the builder to be of type DOMBuilder and it works as
expected.

Is this a bug or expected behaviour?  I am using JDOM-B5, jdk1.3,
win2000.  If it helps I had the same problem using Xalan XPath support
- and narrowed the problem down to the DTD and a namespace issue.  The
DTD for tld files has a taglib element defined as

<!ELEMENT taglib (tlibversion, jspversion?, shortname, uri?, info?,
tag+) >
<!ATTLIST taglib id ID #IMPLIED
	  xmlns CDATA #FIXED
		"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"
>

removing the
   xmlns CDATA #FIXED
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"

and running again with XPath/Xalan and SAXBuilder did the trick.

While I am at it when setting the DOCTYPE to SYSTEM the URI of the DTD
(same directory as tld) needed a path from the working directory with
DOMBuilder but not SAXBuilder - got a JDOMException file not found.


Ewan

=====
Ewan Harrow                ewan at harrow.org          
 mb: 07092 108950           http://www.harrow.org
 http://www.ewanharrow.com  http://travel.ewanharrow.com

__________________________________________________
Do You Yahoo!?
Get email at your own domain with Yahoo! Mail. 
http://personal.mail.yahoo.com/