/*
 * XMLConstants.java
 * Copyright (C) 2004 The Free Software Foundation
 * 
 * This file is part of GNU JAXP, a library.
 *
 * GNU JAXP is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * GNU JAXP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library.  Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obliged to do so.  If you do not wish to do so, delete this
 * exception statement from your version. 
 */

package javax.xml;

/**
 * Repository for well-known XML constants.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 * @since 1.3
 */
public final class XMLConstants
{

  /**
   * Dummy namespace URI indicating that there is no namespace.
   * @see http://www.w3.org/TR/REC-xml-names/#defaulting
   */
  public static final String NULL_NS_URI = "";

  /**
   * Dummy namespace prefix indicating that there is no namespace.
   * @see http://www.w3.org/TR/REC-xml-names/#ns-qualnames
   */
  public static final String DEFAULT_NS_PREFIX = "";

  /**
   * The XML Namespace URI.
   * @see http://www.w3.org/TR/REC-xml-names/#ns-qualnames
   */
  public static final String XML_NS_URI =
	 	"http://www.w3.org/XML/1998/namespace";

  /**
   * The XML Namespace prefix.
   * @see http://www.w3.org/TR/REC-xml-names/#ns-qualnames
   */
  public static final String XML_NS_PREFIX = "xml";

  /**
   * The XML Namespace declaration URI.
   * @see http://www.w3.org/TR/REC-xml-names/#ns-qualnames
   */
  public static final String XMLNS_ATTRIBUTE_NS_URI =
	 	"http://www.w3.org/2000/xmlns/";

  /**
   * The XML Namespace declaration attribute.
   * @see http://www.w3.org/TR/REC-xml-names/#ns-qualnames
   */
  public static final String XMLNS_ATTRIBUTE = "xmlns";

  /**
   * The XML Schema (XSD) namespace URI.
   * @see http://www.w3.org/TR/xmlschema-1/#Instance_Document_Constructions
   */
  public static final String W3C_XML_SCHEMA_NS_URI =
	 	"http://www.w3.org/2001/XMLSchema";

  /**
   * The XML Schema Instance (XSI) namespace URI.
   * @see http://www.w3.org/TR/xmlschema-1/#Instance_Document_Constructions
   */
  public static final String W3C_XML_SCHEMA_INSTANCE_NS_URI =
	 	"http://www.w3.org/2001/XMLSchema-instance";

  /**
   * The XPath 2.0 datatypes namespace URI.
   * @see http://www.w3.org/TR/xpath-datamodel
   */
  public static final String W3C_XPATH_DATATYPE_NS_URI =
	 	"http://www.w3.org/2003/11/xpath-datatypes";

  /**
   * The XML DTD namespace URI.
   */
  public static final String XML_DTD_NS_URI = "http://www.w3.org/TR/REC-xml";

  /**
   * The RELAX NG Namespace URI.
   * @see http://relaxng.org/spec-20011203.html
   */
  public static final String RELAXNG_NS_URI =
	 	"http://relaxng.org/ns/structure/1.0";

  /**
   * DOM feature for secure processing.
   */
  public static final String FEATURE_SECURE_PROCESSING =
	 	"http://javax.xml.XMLConstants/feature/secure-processing";
  
}
