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  /*
   * $Id: XMLConstants.java,v 1.9 2010-11-01 04:36:08 joehw Exp $
   * %W% %E%
   */
  package mf.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: 1.9 $, $Date: 2010-11-01 04:36:08 $
   * @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>Namespace URI to use to represent that there is no Namespace.</p>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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/>
       * <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>
       * <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";
  
      /**
       * <p>Private constructor to prevent instantiation.</p>
       */
      private XMLConstants() {
      }
  }
  