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   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE 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 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE 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 AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package jaxp.xml;
  
  import jaxp.xml.parsers.SAXParser;
  import jaxp.xml.transform.Transformer;
  import jaxp.xml.transform.TransformerConfigurationException;
  import jaxp.xml.transform.TransformerFactory;
  import jaxp.xml.validation.SchemaFactory;
  
  /**
   * <p>Utility class to contain basic XML values as constants.</p>
   *
   * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
   * @version $Revision: 1.8 $, $Date: 2010/05/25 16:19:45 $
   * @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}".</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}".</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/}".</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}".</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}".
       *
       * @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}".</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}".</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}".
       */
      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}".</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} 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} instructs the implementation to process XML in accordance with the XML specifications
           *     ignoring 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>Property: accessExternalDTD</p>
           *
           * <p>
           * Restrict access to external DTDs and external Entity References to the protocols specified.
           * If access is denied due to the restriction of this property, a runtime exception that
           * is specific to the context is thrown. In the case of {@link SAXParser}
           * for example, {@link org.xml.sax.SAXException} is thrown.
           * </p>
           *
           * <p>
           * <b>Value: </b> a list of protocols separated by comma. A protocol is the scheme portion of a
           * {@link java.net.URI}, or in the case of the JAR protocol, "jar" plus the scheme portion
           * separated by colon.
           * A scheme is defined as:
           *
           * <blockquote>
           * scheme = alpha *( alpha | digit | "+" | "-" | "." )<br>
           * where alpha = a-z and A-Z.<br><br>
           *
           * And the JAR protocol:<br>
           *
           * jar[:scheme]<br><br>
           *
           * Protocols including the keyword "jar" are case-insensitive. Any whitespaces as defined by
           * {@link java.lang.Character#isSpaceChar } in the value will be ignored.
           * Examples of protocols are file, http, jar:file.
           *
           * </blockquote>
           *</p>
           *
           *<p>
           * <b>Default value:</b> The default value is implementation specific and therefore not specified.
           * The following options are provided for consideration:
           * <blockquote>
           * <UL>
           *     <LI>an empty string to deny all access to external references;</LI>
           *     <LI>a specific protocol, such as file, to give permission to only the protocol;</LI>
           *     <LI>the keyword "all" to grant  permission to all protocols.</LI>
           *</UL><br>
           *      When FEATURE_SECURE_PROCESSING is enabled,  it is recommended that implementations
           *      restrict external connections by default, though this may cause problems for applications
           *      that process XML/XSD/XSL with external references.
           * </blockquote>
           * </p>
           *
           * <p>
           * <b>Granting all access:</b>  the keyword "all" grants permission to all protocols.
           * </p>
           * <p>
           * <b>System Property:</b> The value of this property can be set or overridden by
           * system property {@code javax.xml.accessExternalDTD}.
           * </p>
           *
           * <p>
           * <b>${JAVA_HOME}/lib/jaxp.properties:</b> This configuration file is in standard
           * {@link java.util.Properties} format. If the file exists and the system property is specified,
           * its value will be used to override the default of the property.
           * </p>
           *
           * <p>
           *
           * </p>
           * @since 1.7
           */
          public static final String ACCESS_EXTERNAL_DTD = "http://javax.xml.XMLConstants/property/accessExternalDTD";
  
          /**
           * <p>Property: accessExternalSchema</p>
           *
           * <p>
           * Restrict access to the protocols specified for external reference set by the
           * schemaLocation attribute, Import and Include element. If access is denied
           * due to the restriction of this property, a runtime exception that is specific
           * to the context is thrown. In the case of {@link SchemaFactory}
           * for example, org.xml.sax.SAXException is thrown.
           * </p>
           * <p>
           * <b>Value:</b> a list of protocols separated by comma. A protocol is the scheme portion of a
           * {@link java.net.URI}, or in the case of the JAR protocol, "jar" plus the scheme portion
           * separated by colon.
           * A scheme is defined as:
           *
           * <blockquote>
           * scheme = alpha *( alpha | digit | "+" | "-" | "." )<br>
           * where alpha = a-z and A-Z.<br><br>
           *
           * And the JAR protocol:<br>
           *
           * jar[:scheme]<br><br>
           *
           * Protocols including the keyword "jar" are case-insensitive. Any whitespaces as defined by
           * {@link java.lang.Character#isSpaceChar } in the value will be ignored.
           * Examples of protocols are file, http, jar:file.
           *
           * </blockquote>
           *</p>
           *
           *<p>
           * <b>Default value:</b> The default value is implementation specific and therefore not specified.
           * The following options are provided for consideration:
           * <blockquote>
           * <UL>
           *     <LI>an empty string to deny all access to external references;</LI>
           *     <LI>a specific protocol, such as file, to give permission to only the protocol;</LI>
           *     <LI>the keyword "all" to grant  permission to all protocols.</LI>
           *</UL><br>
           *      When FEATURE_SECURE_PROCESSING is enabled,  it is recommended that implementations
           *      restrict external connections by default, though this may cause problems for applications
           *      that process XML/XSD/XSL with external references.
           * </blockquote>
           * </p>
           * <p>
           * <b>Granting all access:</b>  the keyword "all" grants permission to all protocols.
           * </p>
           *
           * <p>
           * <b>System Property:</b> The value of this property can be set or overridden by
           * system property {@code javax.xml.accessExternalSchema}
           * </p>
           *
           * <p>
           * <b>${JAVA_HOME}/lib/jaxp.properties:</b> This configuration file is in standard
           * java.util.Properties format. If the file exists and the system property is specified,
           * its value will be used to override the default of the property.
           *
           * @since 1.7
           * </p>
           */
          public static final String ACCESS_EXTERNAL_SCHEMA = "http://javax.xml.XMLConstants/property/accessExternalSchema";
  
          /**
           * <p>Property: accessExternalStylesheet</p>
           *
           * <p>
           * Restrict access to the protocols specified for external references set by the
           * stylesheet processing instruction, Import and Include element, and document function.
           * If access is denied due to the restriction of this property, a runtime exception
           * that is specific to the context is thrown. In the case of constructing new
           * {@link Transformer} for example,
           * {@link TransformerConfigurationException}
           * will be thrown by the {@link TransformerFactory}.
           * </p>
           * <p>
           * <b>Value:</b> a list of protocols separated by comma. A protocol is the scheme portion of a
           * {@link java.net.URI}, or in the case of the JAR protocol, "jar" plus the scheme portion
           * separated by colon.
           * A scheme is defined as:
           *
           * <blockquote>
           * scheme = alpha *( alpha | digit | "+" | "-" | "." )<br>
           * where alpha = a-z and A-Z.<br><br>
           *
           * And the JAR protocol:<br>
           *
           * jar[:scheme]<br><br>
           *
           * Protocols including the keyword "jar" are case-insensitive. Any whitespaces as defined by
           * {@link java.lang.Character#isSpaceChar } in the value will be ignored.
           * Examples of protocols are file, http, jar:file.
           *
           * </blockquote>
           *</p>
           *
           *<p>
           * <b>Default value:</b> The default value is implementation specific and therefore not specified.
           * The following options are provided for consideration:
           * <blockquote>
           * <UL>
           *     <LI>an empty string to deny all access to external references;</LI>
           *     <LI>a specific protocol, such as file, to give permission to only the protocol;</LI>
           *     <LI>the keyword "all" to grant  permission to all protocols.</LI>
           *</UL><br>
           *      When FEATURE_SECURE_PROCESSING is enabled,  it is recommended that implementations
           *      restrict external connections by default, though this may cause problems for applications
           *      that process XML/XSD/XSL with external references.
           * </blockquote>
           * </p>
           * <p>
           * <b>Granting all access:</b>  the keyword "all" grants permission to all protocols.
           * </p>
           *
           * <p>
           * <b>System Property:</b> The value of this property can be set or overridden by
           * system property {@code javax.xml.accessExternalStylesheet}
           * </p>
           *
           * <p>
           * <b>${JAVA_HOME}/lib/jaxp.properties: </b> This configuration file is in standard
           * java.util.Properties format. If the file exists and the system property is specified,
           * its value will be used to override the default of the property.
           *
           * @since 1.7
           */
          public static final String ACCESS_EXTERNAL_STYLESHEET = "http://javax.xml.XMLConstants/property/accessExternalStylesheet";
  
  }
  