The source code

/**@class javax.xml.XMLConstants
@extends java.lang.Object

 <p>Utility class to contain basic XML values as constants.</p>

 @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
 @version $Revision: 584477 $, $Date: 2007-10-13 19:44:03 -0700 (Sat, 13 Oct 2007) $
 @see <a href="http://www.w3.org/TR/xml11/">Extensible Markup Language (XML) 1.1</a>
 @see <a href="http://www.w3.org/TR/REC-xml">Extensible Markup Language (XML) 1.0 (Second Edition)</a>
 @see <a href="http://www.w3.org/XML/xml-V10-2e-errata">XML 1.0 Second Edition Specification Errata</a>
 @see <a href="http://www.w3.org/TR/xml-names11/">Namespaces in XML 1.1</a>
 @see <a href="http://www.w3.org/TR/REC-xml-names">Namespaces in XML</a>
 @see <a href="http://www.w3.org/XML/xml-names-19990114-errata">Namespaces in XML Errata</a>
 @see <a href="http://www.w3.org/TR/xmlschema-1/">XML Schema Part 1: Structures</a>
 @since 1.5
*/
var XMLConstants = {

/** <p>Namespace URI to use to represent that there is no Namespace.</p>

 <p>Defined by the Namespace specification to be "".</p>

 @see <a href="http://www.w3.org/TR/REC-xml-names/#defaulting">
 Namespaces in XML, 5.2 Namespace Defaulting</a>
*/
NULL_NS_URI : "",
/** <p>Prefix to use to represent the default XML Namespace.</p>

 <p>Defined by the XML specification to be "".</p>

 @see <a href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">
 Namespaces in XML, 3. Qualified Names</a>
*/
DEFAULT_NS_PREFIX : "",
/** <p>The official XML Namespace name URI.</p>

 <p>Defined by the XML specification to be
 "<code>http://www.w3.org/XML/1998/namespace</code>".</p>

 @see <a href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">
 Namespaces in XML, 3. Qualified Names</a>
*/
XML_NS_URI : "http://www.w3.org/XML/1998/namespace",
/** <p>The official XML Namespace prefix.</p>

 <p>Defined by the XML specification to be "<code>xml</code>".</p>

 @see <a href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">
 Namespaces in XML, 3. Qualified Names</a>
*/
XML_NS_PREFIX : "xml",
/** <p>The official XML attribute used for specifying XML Namespace
 declarations, {@link #XMLNS_ATTRIBUTE
 javax.xml.XMLConstants.XMLNS_ATTRIBUTE}, Namespace name URI.</p>

 <p>Defined by the XML specification to be
 "<code>http://www.w3.org/2000/xmlns/</code>".</p>

 @see <a href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">
 Namespaces in XML, 3. Qualified Names</a>
 @see <a href="http://www.w3.org/XML/xml-names-19990114-errata/">
 Namespaces in XML Errata</a>
*/
XMLNS_ATTRIBUTE_NS_URI : "http://www.w3.org/2000/xmlns/",
/** <p>The official XML attribute used for specifying XML Namespace
 declarations.</p>

 <p>It is <strong><em>NOT</em></strong> valid to use as a
 prefix.  Defined by the XML specification to be
 "<code>xmlns</code>".</p>

 @see <a href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">
 Namespaces in XML, 3. Qualified Names</a>
*/
XMLNS_ATTRIBUTE : "xmlns",
/** <p>W3C XML Schema Namespace URI.</p>

 <p>Defined to be "<code>http://www.w3.org/2001/XMLSchema</code>".

 @see <a href="http://www.w3.org/TR/xmlschema-1/#Instance_Document_Constructions">
  XML Schema Part 1:
  Structures, 2.6 Schema-Related Markup in Documents Being Validated</a>
*/
W3C_XML_SCHEMA_NS_URI : "http://www.w3.org/2001/XMLSchema",
/** <p>W3C XML Schema Instance Namespace URI.</p>

 <p>Defined to be "<code>http://www.w3.org/2001/XMLSchema-instance</code>".</p>

 @see <a href="http://www.w3.org/TR/xmlschema-1/#Instance_Document_Constructions">
  XML Schema Part 1:
  Structures, 2.6 Schema-Related Markup in Documents Being Validated</a>
*/
W3C_XML_SCHEMA_INSTANCE_NS_URI : "http://www.w3.org/2001/XMLSchema-instance",
/** <p>W3C XPath Datatype Namespace URI.</p>

 <p>Defined to be "<code>http://www.w3.org/2003/11/xpath-datatypes</code>".</p>

 @see <a href="http://www.w3.org/TR/xpath-datamodel">XQuery 1.0 and XPath 2.0 Data Model</a>
*/
W3C_XPATH_DATATYPE_NS_URI : "http://www.w3.org/2003/11/xpath-datatypes",
/** <p>XML Document Type Declaration Namespace URI as an arbitrary value.</p>

 <p>Since not formally defined by any existing standard, arbitrarily define to be "<code>http://www.w3.org/TR/REC-xml</code>".
*/
XML_DTD_NS_URI : "http://www.w3.org/TR/REC-xml",
/** <p>RELAX NG Namespace URI.</p>

 <p>Defined to be "<code>http://relaxng.org/ns/structure/1.0</code>".</p>

 @see <a href="http://relaxng.org/spec-20011203.html">RELAX NG Specification</a>
*/
RELAXNG_NS_URI : "http://relaxng.org/ns/structure/1.0",
/** <p>Feature for secure processing.</p>

 <ul>
   <li>
     <code>true</code> instructs the implementation to process XML securely.
     This may set limits on XML constructs to avoid conditions such as denial of service attacks.
   </li>
   <li>
     <code>false</code> instructs the implementation to process XML according to the letter of the XML specifications
     ignoring security issues such as limits on XML constructs to avoid conditions such as denial of service attacks.
   </li>
 </ul>
*/
FEATURE_SECURE_PROCESSING : "http://javax.xml.XMLConstants/feature/secure-processing",

};