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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// $Id: XMLConstants.java 584477 2007-10-14 02:44:03Z mrglavas $

package javax.xml;

/**
 * Utility class to contain basic XML values as constants.
 *
 * @author Jeff Suttor
 * @version $Revision: 584477 $, $Date: 2007-10-13 22:44:03 -0400 (Sat, 13 Oct 2007) $
 * @see Extensible Markup Language (XML) 1.1
 * @see Extensible Markup Language (XML) 1.0 (Second Edition)
 * @see XML 1.0 Second Edition Specification Errata
 * @see Namespaces in XML 1.1
 * @see Namespaces in XML
 * @see Namespaces in XML Errata
 * @see XML Schema Part 1: Structures
 * @since 1.5
 **/
public final class XMLConstants {

    /**
     * Private constructor to prevent instantiation.
     */
    private XMLConstants() {
    }

    /**
     * Namespace URI to use to represent that there is no Namespace.
     *
     * Defined by the Namespace specification to be "".
     *
     * @see 
     * Namespaces in XML, 5.2 Namespace Defaulting
     */
    public static final String NULL_NS_URI = "";

    /**
     * Prefix to use to represent the default XML Namespace.
     *
     * Defined by the XML specification to be "".
     *
     * @see 
     * Namespaces in XML, 3. Qualified Names
     */
    public static final String DEFAULT_NS_PREFIX = "";

    /**
     * The official XML Namespace name URI.
     *
     * Defined by the XML specification to be
     * "http://www.w3.org/XML/1998/namespace".
     *
     * @see 
     * Namespaces in XML, 3. Qualified Names
     */
    public static final String XML_NS_URI =
        "http://www.w3.org/XML/1998/namespace";

    /**
     * The official XML Namespace prefix.
     *
     * Defined by the XML specification to be "xml".
     *
     * @see 
     * Namespaces in XML, 3. Qualified Names<
     */
    public static final String XML_NS_PREFIX = "xml";

    /**
     * The official XML attribute used for specifying XML Namespace
     * declarations, {@link #XMLNS_ATTRIBUTE
     * XMLConstants.XMLNS_ATTRIBUTE}, Namespace name URI.
     *
     * Defined by the XML specification to be
     * "http://www.w3.org/2000/xmlns/".
     *
     * @see 
     * Namespaces in XML, 3. Qualified Names
     * @see 
     * Namespaces in XML Errata
     */
    public static final String XMLNS_ATTRIBUTE_NS_URI =
        "http://www.w3.org/2000/xmlns/";

    /**
     * The official XML attribute used for specifying XML Namespace
     * declarations.
     *
     * It is NOT valid to use as a
     * prefix.  Defined by the XML specification to be
     * "xmlns".
     *
     * @see 
     * Namespaces in XML, 3. Qualified Names
     */
    public static final String XMLNS_ATTRIBUTE = "xmlns";

    /**
     * W3C XML Schema Namespace URI.
     * 
     * Defined to be "http://www.w3.org/2001/XMLSchema".
     * 
     * @see 
     *  XML Schema Part 1:
     *  Structures, 2.6 Schema-Related Markup in Documents Being Validated
     */
    public static final String W3C_XML_SCHEMA_NS_URI =
        "http://www.w3.org/2001/XMLSchema";

    /**
     * 
W3C XML Schema Instance Namespace URI.
     * 
     * Defined to be "http://www.w3.org/2001/XMLSchema-instance".
     * 
     * @see 
     *  XML Schema Part 1:
     *  Structures, 2.6 Schema-Related Markup in Documents Being Validated
     */
    public static final String W3C_XML_SCHEMA_INSTANCE_NS_URI =
        "http://www.w3.org/2001/XMLSchema-instance";

    /**
     * W3C XPath Datatype Namespace URI.
     * 
     * Defined to be "http://www.w3.org/2003/11/xpath-datatypes".
     * 
     * @see XQuery 1.0 and XPath 2.0 Data Model
     */
    public static final String W3C_XPATH_DATATYPE_NS_URI = "http://www.w3.org/2003/11/xpath-datatypes";

    /**
     * XML Document Type Declaration Namespace URI as an arbitrary value.
     * 
     * Since not formally defined by any existing standard, arbitrarily define to be "http://www.w3.org/TR/REC-xml".
     */
    public static final String XML_DTD_NS_URI = "http://www.w3.org/TR/REC-xml";

    /**
     * 
RELAX NG Namespace URI.
     * 
     * Defined to be "http://relaxng.org/ns/structure/1.0".
     * 
     * @see RELAX NG Specification
     */
    public static final String RELAXNG_NS_URI = "http://relaxng.org/ns/structure/1.0";

    /**
     * Feature for secure processing.
     * 
     * 
     *   
     *     true instructs the implementation to process XML securely.
     *     This may set limits on XML constructs to avoid conditions such as denial of service attacks.
     *   
     *   
     *     false 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.
     *   
     * 
     */    
    public static final String FEATURE_SECURE_PROCESSING = "http://javax.xml.XMLConstants/feature/secure-processing";
}