XOM API for Processing XML with Java

["Greg Saunders" <saundersgreg AT hotmail.com>]

Hi,

Apologies if I am not sending this email correctly, or if this question has 
already been answered. (Is the email list archive [1] searchable on the 
web?)

I would like to write an XML instance document that is valid against an XML 
schema.

Here is the XML schema (note that I import the XML namespace to reference 
its xml:lang attribute), translation.xsd:

<?xml version="1.0" encoding="UTF-8"?>

<xsd:schema
       xmlns:xsd="http://www.w3.org/2001/XMLSchema";
       xmlns:xml="http://www.w3.org/XML/1998/namespace";
       xmlns="http://www.myexample.org/";
       targetNamespace="http://www.myexample.org/";
       >

   <xsd:import
           namespace="http://www.w3.org/XML/1998/namespace";
           schemaLocation="http://www.w3.org/2001/03/xml.xsd";
           />

   <xsd:element name="translation" type="TranslationType"/>

   <xsd:complexType name="TranslationType">
       <xsd:sequence>
           <xsd:element name="h" type="xsd:string"/>
           <xsd:element name="p" type="xsd:string" minOccurs="0" 
maxOccurs="unbounded"/>
       </xsd:sequence>

       <xsd:attribute ref="xml:lang" use="required"/>
       <xsd:attribute name="original" type="xsd:boolean" use="required"/>
   </xsd:complexType>

</xsd:schema>

Here is the XML instance document (note that I'm using the common xml:lang 
attribute), translation-en.xml:

<cc:translation
       xmlns:cc="http://www.myexample.org/";
       xmlns:xml="http://www.w3.org/XML/1998/namespace";
       xml:lang="en"
       original="true"
       >

   <h>This is a heading</h>
   <p>This is a paragraph that belongs to the heading</p>
   <p>This is another paragraph belonging to the same heading</p>

</cc:translation>


But following the directions in the XOM tutorial [2]. . .

try {
 Builder parser = new Builder();
 Document doc = 
parser.build("http://www.myexample.org/translation-en.xml";);
}
catch (ParsingException ex) {
 System.err.println("The translation is malformed today. How 
embarrassing!");
}
catch (IOException ex) {
 System.err.println("Could not connect to www.myexample.org. The site may 
be down.");
}

. . .  I get:

nu.xom.ParsingException: Illegal Namespace prefix: "xml". at line 6, column 
-1.

Why is my "xml" prefix illegal?  Do I really have to re-invent the "lang" 
attribute?

(The exception mysteriously disappears when I include (the Xerces 2.6.2) 
xercesImpl.jar in the runtime classpath.)


[1] https://lists.ibiblio.org/sympa/arc/xom-interest/
[2] http://www.cafeconleche.org/XOM/tutorial.xhtml#d0e415