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JDK 1.6
  org.w3c.dom. Entity View Javadoc
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/*
 * Copyright (c) 2004 World Wide Web Consortium,
 *
 * (Massachusetts Institute of Technology, European Research Consortium for
 * Informatics and Mathematics, Keio University). All Rights Reserved. This
 * work is distributed under the W3C(r) Software License [1] 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.
 *
 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */

package org.w3c.dom;

/**
 * This interface represents a known entity, either parsed or unparsed, in an 
 * XML document. Note that this models the entity itself <em>not</em> the entity declaration.
 * <p>The <code>nodeName</code> attribute that is inherited from 
 * <code>Node</code> contains the name of the entity.
 * <p>An XML processor may choose to completely expand entities before the 
 * structure model is passed to the DOM; in this case there will be no 
 * <code>EntityReference</code> nodes in the document tree.
 * <p>XML does not mandate that a non-validating XML processor read and 
 * process entity declarations made in the external subset or declared in 
 * parameter entities. This means that parsed entities declared in the 
 * external subset need not be expanded by some classes of applications, and 
 * that the replacement text of the entity may not be available. When the <a href='http://www.w3.org/TR/2004/REC-xml-20040204#intern-replacement'>
 * replacement text</a> is available, the corresponding <code>Entity</code> node's child list 
 * represents the structure of that replacement value. Otherwise, the child 
 * list is empty.
 * <p>DOM Level 3 does not support editing <code>Entity</code> nodes; if a 
 * user wants to make changes to the contents of an <code>Entity</code>, 
 * every related <code>EntityReference</code> node has to be replaced in the 
 * structure model by a clone of the <code>Entity</code>'s contents, and 
 * then the desired changes must be made to each of those clones instead. 
 * <code>Entity</code> nodes and all their descendants are readonly.
 * <p>An <code>Entity</code> node does not have any parent.
 * <p ><b>Note:</b> If the entity contains an unbound namespace prefix, the 
 * <code>namespaceURI</code> of the corresponding node in the 
 * <code>Entity</code> node subtree is <code>null</code>. The same is true 
 * for <code>EntityReference</code> nodes that refer to this entity, when 
 * they are created using the <code>createEntityReference</code> method of 
 * the <code>Document</code> interface.
 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.
 */
public interface Entity extends Node {
    /**
     * The public identifier associated with the entity if specified, and 
     * <code>null</code> otherwise.
     */
    public String getPublicId();

    /**
     * The system identifier associated with the entity if specified, and 
     * <code>null</code> otherwise. This may be an absolute URI or not.
     */
    public String getSystemId();

    /**
     * For unparsed entities, the name of the notation for the entity. For 
     * parsed entities, this is <code>null</code>.
     */
    public String getNotationName();

    /**
     * An attribute specifying the encoding used for this entity at the time 
     * of parsing, when it is an external parsed entity. This is 
     * <code>null</code> if it an entity from the internal subset or if it 
     * is not known.
     * @since DOM Level 3
     */
    public String getInputEncoding();

    /**
     * An attribute specifying, as part of the text declaration, the encoding 
     * of this entity, when it is an external parsed entity. This is 
     * <code>null</code> otherwise.
     * @since DOM Level 3
     */
    public String getXmlEncoding();

    /**
     * An attribute specifying, as part of the text declaration, the version 
     * number of this entity, when it is an external parsed entity. This is 
     * <code>null</code> otherwise.
     * @since DOM Level 3
     */
    public String getXmlVersion();

}

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