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JDK 1.6
  javax.xml. XMLConstants View Javadoc 
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/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
 * You can obtain a copy of the license at
 * https://jaxp.dev.java.net/CDDLv1.0.html.
 * See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * https://jaxp.dev.java.net/CDDLv1.0.html
 * If applicable add the following below this CDDL HEADER
 * with the fields enclosed by brackets "[]" replaced with
 * your own identifying information: Portions Copyright
 * [year] [name of copyright owner]
 */

/*
 * $Id: XMLEntityReader.java,v 1.3 2005/11/03 17:02:21 jeffsuttor Exp $
 * @(#)XMLConstants.java	1.15 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
 */

package javax.xml;

/**
 * <p>Utility class to contain basic XML values as constants.</p>
 *
 * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
 * @version $Revision: 1.2 $, $Date: 2005/06/10 03:50:26 $
 * @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
 **/

public final class XMLConstants {
	
    /**
     * <p>Private constructor to prevent instantiation.</p>
     */
	private 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>
     */
    public static final String 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>
     */
    public static final String 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>
     */
    public static final String 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>
     */
    public static final String XML_NS_PREFIX = "xml";

    /**
     * <p>The official XML attribute used for specifying XML Namespace
     * declarations, {@link #XMLNS_ATTRIBUTE
     * 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>
     */
    public static final String 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>
     */
    public static final String 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>
     */
    public static final String 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>
     */
    public static final String 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>
	 */
	public static final String 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>".
     */
    public static final String 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>
	 */
	public static final String 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 acording the letter of the XML specifications
	 *     ingoring security issues such as limits on XML constructs to avoid conditions such as denial of service attacks.
	 *   </li>
	 * </ul>
	 */    
	public static final String FEATURE_SECURE_PROCESSING = "http://javax.xml.XMLConstants/feature/secure-processing";
}
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