[jdom-interest] Problem with DOCTYPE and SAXBuilder

[Ewan Harrow]

Thanks for that it indeed does now work with SAXBuilder... but not with
DOMBuilder now - I assume because it is broken with beta 5.  I'll try
with the latest build.

--- Jason Hunter <jhunter at collab.net> wrote: > Here's what's going on. 
The following in the DTD...
> 
> <!ATTLIST taglib id ID #IMPLIED
>           xmlns CDATA #FIXED
>                
> "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"
> >
> 
> sets the default namespace to http://java.sun.com/.....  This
> requires
> that when you access an element by name in JDOM you pass in the
> proper
> Namespace for the element like this:
> 
> Namespace ns = Namespace.getNamespace("", "http://.....");
> List tags = taglib.getChildren("tag", ns);
> 
> You were asking for children outside a namespace, of which there were
> none.  When you removed the xmlns in the DTD, then things worked as
> expected.  The reason DOMBuilder "worked" for you without you needing
> to
> pass in a namespace is because DOMBuilder namespaces in beta5 were
> broken and those elements weren't being put in the proper namespace. 
> DOMBuilder is fixed in the latest snapshot, so you'll need to do the
> right thing now always, as shown above.
> 
> -jh-
> 
> Ewan Harrow wrote:
> > 
> > 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
> > 
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=====
Ewan Harrow                ewan at harrow.org          
 mb: 07092 108950           http://www.harrow.org
 http://www.ewanharrow.com  http://travel.ewanharrow.com

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