dom4j-user  

[dom4j-user] Re: Something wrong with XPATH

Evan Kirkconnell
Thu, 15 Dec 2005 10:08:34 -0800

My doctype appears to be the culprit.

Evan Kirkconnell wrote:


Hello all,
I can't seem to get XPATH to work properly. The only thing I've been able to select is the root node. 

Any help is much apreciated.

Thanks,

--Evan
Here's my HTML, code, and input/output. I think I must be doing something fundamentally wrong, but can't seem to spot it. 

test.html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> 
<html>
   <head>
       <title>Title</title>
       <style>
           body{
               background: blue;
           }
       </style>
   </head>
   <body>
       <div id="main">
           HI!
       </div>
   </body>
</html>

CODE:(note: args[0] is the file, args[1] is the XPath expression)

Document doc = DOM.getCachedDocument(args[0]);
Element root = doc.getRootElement();
List l = root.selectNodes(args[1]);
if(l.size() > 0){
   Element elem = (Element)l.get(0);
   Element p = elem.addElement("p");
   p.setText("hi");
}else{
   System.out.println(" NO MATCHES! ");
}
DOM.print( doc, new PrintWriter(System.out, true) );

TRIES:

./run.sh test.html /html/body
NO MATCHES!
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> 

<html xmlns="http://www.w3.org/1999/xhtml";>
       <head>
               <title>Title</title>
               <style xml:space="preserve">
                       body{
                               background: blue;
                       }
               </style>
       </head>
       <body>
               <div id="main">
                       HI!
               </div>
       </body>
</html>



./run.sh test.html *
NO MATCHES!
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> 

<html xmlns="http://www.w3.org/1999/xhtml";>
       <head>
               <title>Title</title>
               <style xml:space="preserve">
                       body{
                               background: blue;
                       }
               </style>
       </head>
       <body>
               <div id="main">
                       HI!
               </div>
       </body>
</html>

This one works:

./run.sh test.html .
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";> 

<html xmlns="http://www.w3.org/1999/xhtml";>
       <head>
               <title>Title</title>
               <style xml:space="preserve">
                       body{
                               background: blue;
                       }
               </style>
       </head>
       <body>
               <div id="main">
                       HI!
               </div>
       </body>
       <p>hi</p>
</html>
I don't really understand this either. If the context node doesn't throw this, why would the root node? 

./run.sh test.html /
java.lang.ClassCastException
       at edu.uark.util.dom.DOMTest.main(DOMTest.java:17)







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