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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * 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,

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 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file and, per its terms, should not be removed:

 *

 * 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;

/**

 * The <code>Element</code> interface represents an element in an HTML or XML

 * document. Elements may have attributes associated with them; since the

 * <code>Element</code> interface inherits from <code>Node</code>, the

 * generic <code>Node</code> interface attribute <code>attributes</code> may

 * be used to retrieve the set of all attributes for an element. There are

 * methods on the <code>Element</code> interface to retrieve either an

 * <code>Attr</code> object by name or an attribute value by name. In XML,

 * where an attribute value may contain entity references, an

 * <code>Attr</code> object should be retrieved to examine the possibly

 * fairly complex sub-tree representing the attribute value. On the other

 * hand, in HTML, where all attributes have simple string values, methods to

 * directly access an attribute value can safely be used as a convenience.

 * <p ><b>Note:</b> In DOM Level 2, the method <code>normalize</code> is

 * inherited from the <code>Node</code> interface where it was moved.

 * <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 Element extends Node {

    /**

     * The name of the element. If <code>Node.localName</code> is different

     * from <code>null</code>, this attribute is a qualified name. For

     * example, in:

     * <pre> &lt;elementExample id="demo"&gt; ...

     * &lt;/elementExample&gt; , </pre>

     *  <code>tagName</code> has the value

     * <code>"elementExample"</code>. Note that this is case-preserving in

     * XML, as are all of the operations of the DOM. The HTML DOM returns

     * the <code>tagName</code> of an HTML element in the canonical

     * uppercase form, regardless of the case in the source HTML document.

     */

    public String getTagName();

    /**

     * Retrieves an attribute value by name.

     * @param name The name of the attribute to retrieve.

     * @return The <code>Attr</code> value as a string, or the empty string

     *   if that attribute does not have a specified or default value.

     */

    public String getAttribute(String name);

    /**

     * Adds a new attribute. If an attribute with that name is already present

     * in the element, its value is changed to be that of the value

     * parameter. This value is a simple string; it is not parsed as it is

     * being set. So any markup (such as syntax to be recognized as an

     * entity reference) is treated as literal text, and needs to be

     * appropriately escaped by the implementation when it is written out.

     * In order to assign an attribute value that contains entity

     * references, the user must create an <code>Attr</code> node plus any

     * <code>Text</code> and <code>EntityReference</code> nodes, build the

     * appropriate subtree, and use <code>setAttributeNode</code> to assign

     * it as the value of an attribute.

     * <br>To set an attribute with a qualified name and namespace URI, use

     * the <code>setAttributeNS</code> method.

     * @param name The name of the attribute to create or alter.

     * @param value Value to set in string form.

     * @exception DOMException

     *   INVALID_CHARACTER_ERR: Raised if the specified name is not an XML

     *   name according to the XML version in use specified in the

     *   <code>Document.xmlVersion</code> attribute.

     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     */

    public void setAttribute(String name,

                             String value)

                             throws DOMException;

    /**

     * Removes an attribute by name. If a default value for the removed

     * attribute is defined in the DTD, a new attribute immediately appears

     * with the default value as well as the corresponding namespace URI,

     * local name, and prefix when applicable. The implementation may handle

     * default values from other schemas similarly but applications should

     * use <code>Document.normalizeDocument()</code> to guarantee this

     * information is up-to-date.

     * <br>If no attribute with this name is found, this method has no effect.

     * <br>To remove an attribute by local name and namespace URI, use the

     * <code>removeAttributeNS</code> method.

     * @param name The name of the attribute to remove.

     * @exception DOMException

     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     */

    public void removeAttribute(String name)

                                throws DOMException;

    /**

     * Retrieves an attribute node by name.

     * <br>To retrieve an attribute node by qualified name and namespace URI,

     * use the <code>getAttributeNodeNS</code> method.

     * @param name The name (<code>nodeName</code>) of the attribute to

     *   retrieve.

     * @return The <code>Attr</code> node with the specified name (

     *   <code>nodeName</code>) or <code>null</code> if there is no such

     *   attribute.

     */

    public Attr getAttributeNode(String name);

    /**

     * Adds a new attribute node. If an attribute with that name (

     * <code>nodeName</code>) is already present in the element, it is

     * replaced by the new one. Replacing an attribute node by itself has no

     * effect.

     * <br>To add a new attribute node with a qualified name and namespace

     * URI, use the <code>setAttributeNodeNS</code> method.

     * @param newAttr The <code>Attr</code> node to add to the attribute list.

     * @return If the <code>newAttr</code> attribute replaces an existing

     *   attribute, the replaced <code>Attr</code> node is returned,

     *   otherwise <code>null</code> is returned.

     * @exception DOMException

     *   WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a

     *   different document than the one that created the element.

     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an

     *   attribute of another <code>Element</code> object. The DOM user must

     *   explicitly clone <code>Attr</code> nodes to re-use them in other

     *   elements.

     */

    public Attr setAttributeNode(Attr newAttr)

                                 throws DOMException;

    /**

     * Removes the specified attribute node. If a default value for the

     * removed <code>Attr</code> node is defined in the DTD, a new node

     * immediately appears with the default value as well as the

     * corresponding namespace URI, local name, and prefix when applicable.

     * The implementation may handle default values from other schemas

     * similarly but applications should use

     * <code>Document.normalizeDocument()</code> to guarantee this

     * information is up-to-date.

     * @param oldAttr The <code>Attr</code> node to remove from the attribute

     *   list.

     * @return The <code>Attr</code> node that was removed.

     * @exception DOMException

     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>NOT_FOUND_ERR: Raised if <code>oldAttr</code> is not an attribute

     *   of the element.

     */

    public Attr removeAttributeNode(Attr oldAttr)

                                    throws DOMException;

    /**

     * Returns a <code>NodeList</code> of all descendant <code>Elements</code>

     * with a given tag name, in document order.

     * @param name The name of the tag to match on. The special value "*"

     *   matches all tags.

     * @return A list of matching <code>Element</code> nodes.

     */

    public NodeList getElementsByTagName(String name);

    /**

     * Retrieves an attribute value by local name and namespace URI.

     * <br>Per [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     * , applications must use the value <code>null</code> as the

     * <code>namespaceURI</code> parameter for methods if they wish to have

     * no namespace.

     * @param namespaceURI The namespace URI of the attribute to retrieve.

     * @param localName The local name of the attribute to retrieve.

     * @return The <code>Attr</code> value as a string, or the empty string

     *   if that attribute does not have a specified or default value.

     * @exception DOMException

     *   NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public String getAttributeNS(String namespaceURI,

                                 String localName)

                                 throws DOMException;

    /**

     * Adds a new attribute. If an attribute with the same local name and

     * namespace URI is already present on the element, its prefix is

     * changed to be the prefix part of the <code>qualifiedName</code>, and

     * its value is changed to be the <code>value</code> parameter. This

     * value is a simple string; it is not parsed as it is being set. So any

     * markup (such as syntax to be recognized as an entity reference) is

     * treated as literal text, and needs to be appropriately escaped by the

     * implementation when it is written out. In order to assign an

     * attribute value that contains entity references, the user must create

     * an <code>Attr</code> node plus any <code>Text</code> and

     * <code>EntityReference</code> nodes, build the appropriate subtree,

     * and use <code>setAttributeNodeNS</code> or

     * <code>setAttributeNode</code> to assign it as the value of an

     * attribute.

     * <br>Per [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     * , applications must use the value <code>null</code> as the

     * <code>namespaceURI</code> parameter for methods if they wish to have

     * no namespace.

     * @param namespaceURI The namespace URI of the attribute to create or

     *   alter.

     * @param qualifiedName The qualified name of the attribute to create or

     *   alter.

     * @param value The value to set in string form.

     * @exception DOMException

     *   INVALID_CHARACTER_ERR: Raised if the specified qualified name is not

     *   an XML name according to the XML version in use specified in the

     *   <code>Document.xmlVersion</code> attribute.

     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is

     *   malformed per the Namespaces in XML specification, if the

     *   <code>qualifiedName</code> has a prefix and the

     *   <code>namespaceURI</code> is <code>null</code>, if the

     *   <code>qualifiedName</code> has a prefix that is "xml" and the

     *   <code>namespaceURI</code> is different from "<a href='http://www.w3.org/XML/1998/namespace'>

     *   http://www.w3.org/XML/1998/namespace</a>", if the <code>qualifiedName</code> or its prefix is "xmlns" and the

     *   <code>namespaceURI</code> is different from "<a href='http://www.w3.org/2000/xmlns/'>http://www.w3.org/2000/xmlns/</a>", or if the <code>namespaceURI</code> is "<a href='http://www.w3.org/2000/xmlns/'>http://www.w3.org/2000/xmlns/</a>" and neither the <code>qualifiedName</code> nor its prefix is "xmlns".

     *   <br>NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public void setAttributeNS(String namespaceURI,

                               String qualifiedName,

                               String value)

                               throws DOMException;

    /**

     * Removes an attribute by local name and namespace URI. If a default

     * value for the removed attribute is defined in the DTD, a new

     * attribute immediately appears with the default value as well as the

     * corresponding namespace URI, local name, and prefix when applicable.

     * The implementation may handle default values from other schemas

     * similarly but applications should use

     * <code>Document.normalizeDocument()</code> to guarantee this

     * information is up-to-date.

     * <br>If no attribute with this local name and namespace URI is found,

     * this method has no effect.

     * <br>Per [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     * , applications must use the value <code>null</code> as the

     * <code>namespaceURI</code> parameter for methods if they wish to have

     * no namespace.

     * @param namespaceURI The namespace URI of the attribute to remove.

     * @param localName The local name of the attribute to remove.

     * @exception DOMException

     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public void removeAttributeNS(String namespaceURI,

                                  String localName)

                                  throws DOMException;

    /**

     * Retrieves an <code>Attr</code> node by local name and namespace URI.

     * <br>Per [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     * , applications must use the value <code>null</code> as the

     * <code>namespaceURI</code> parameter for methods if they wish to have

     * no namespace.

     * @param namespaceURI The namespace URI of the attribute to retrieve.

     * @param localName The local name of the attribute to retrieve.

     * @return The <code>Attr</code> node with the specified attribute local

     *   name and namespace URI or <code>null</code> if there is no such

     *   attribute.

     * @exception DOMException

     *   NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public Attr getAttributeNodeNS(String namespaceURI,

                                   String localName)

                                   throws DOMException;

    /**

     * Adds a new attribute. If an attribute with that local name and that

     * namespace URI is already present in the element, it is replaced by

     * the new one. Replacing an attribute node by itself has no effect.

     * <br>Per [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     * , applications must use the value <code>null</code> as the

     * <code>namespaceURI</code> parameter for methods if they wish to have

     * no namespace.

     * @param newAttr The <code>Attr</code> node to add to the attribute list.

     * @return If the <code>newAttr</code> attribute replaces an existing

     *   attribute with the same local name and namespace URI, the replaced

     *   <code>Attr</code> node is returned, otherwise <code>null</code> is

     *   returned.

     * @exception DOMException

     *   WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a

     *   different document than the one that created the element.

     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an

     *   attribute of another <code>Element</code> object. The DOM user must

     *   explicitly clone <code>Attr</code> nodes to re-use them in other

     *   elements.

     *   <br>NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public Attr setAttributeNodeNS(Attr newAttr)

                                   throws DOMException;

    /**

     * Returns a <code>NodeList</code> of all the descendant

     * <code>Elements</code> with a given local name and namespace URI in

     * document order.

     * @param namespaceURI The namespace URI of the elements to match on. The

     *   special value "*" matches all namespaces.

     * @param localName The local name of the elements to match on. The

     *   special value "*" matches all local names.

     * @return A new <code>NodeList</code> object containing all the matched

     *   <code>Elements</code>.

     * @exception DOMException

     *   NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public NodeList getElementsByTagNameNS(String namespaceURI,

                                           String localName)

                                           throws DOMException;

    /**

     * Returns <code>true</code> when an attribute with a given name is

     * specified on this element or has a default value, <code>false</code>

     * otherwise.

     * @param name The name of the attribute to look for.

     * @return <code>true</code> if an attribute with the given name is

     *   specified on this element or has a default value, <code>false</code>

     *    otherwise.

     * @since 1.4, DOM Level 2

     */

    public boolean hasAttribute(String name);

    /**

     * Returns <code>true</code> when an attribute with a given local name and

     * namespace URI is specified on this element or has a default value,

     * <code>false</code> otherwise.

     * <br>Per [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]

     * , applications must use the value <code>null</code> as the

     * <code>namespaceURI</code> parameter for methods if they wish to have

     * no namespace.

     * @param namespaceURI The namespace URI of the attribute to look for.

     * @param localName The local name of the attribute to look for.

     * @return <code>true</code> if an attribute with the given local name

     *   and namespace URI is specified or has a default value on this

     *   element, <code>false</code> otherwise.

     * @exception DOMException

     *   NOT_SUPPORTED_ERR: May be raised if the implementation does not

     *   support the feature <code>"XML"</code> and the language exposed

     *   through the Document does not support XML Namespaces (such as [<a href='http://www.w3.org/TR/1999/REC-html401-19991224/'>HTML 4.01</a>]).

     * @since 1.4, DOM Level 2

     */

    public boolean hasAttributeNS(String namespaceURI,

                                  String localName)

                                  throws DOMException;

    /**

     *  The type information associated with this element.

     * @since 1.5, DOM Level 3

     */

    public TypeInfo getSchemaTypeInfo();

    /**

     *  If the parameter <code>isId</code> is <code>true</code>, this method

     * declares the specified attribute to be a user-determined ID attribute

     * . This affects the value of <code>Attr.isId</code> and the behavior

     * of <code>Document.getElementById</code>, but does not change any

     * schema that may be in use, in particular this does not affect the

     * <code>Attr.schemaTypeInfo</code> of the specified <code>Attr</code>

     * node. Use the value <code>false</code> for the parameter

     * <code>isId</code> to undeclare an attribute for being a

     * user-determined ID attribute.

     * <br> To specify an attribute by local name and namespace URI, use the

     * <code>setIdAttributeNS</code> method.

     * @param name The name of the attribute.

     * @param isId Whether the attribute is a of type ID.

     * @exception DOMException

     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>NOT_FOUND_ERR: Raised if the specified node is not an attribute

     *   of this element.

     * @since 1.5, DOM Level 3

     */

    public void setIdAttribute(String name,

                               boolean isId)

                               throws DOMException;

    /**

     *  If the parameter <code>isId</code> is <code>true</code>, this method

     * declares the specified attribute to be a user-determined ID attribute

     * . This affects the value of <code>Attr.isId</code> and the behavior

     * of <code>Document.getElementById</code>, but does not change any

     * schema that may be in use, in particular this does not affect the

     * <code>Attr.schemaTypeInfo</code> of the specified <code>Attr</code>

     * node. Use the value <code>false</code> for the parameter

     * <code>isId</code> to undeclare an attribute for being a

     * user-determined ID attribute.

     * @param namespaceURI The namespace URI of the attribute.

     * @param localName The local name of the attribute.

     * @param isId Whether the attribute is a of type ID.

     * @exception DOMException

     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>NOT_FOUND_ERR: Raised if the specified node is not an attribute

     *   of this element.

     * @since 1.5, DOM Level 3

     */

    public void setIdAttributeNS(String namespaceURI,

                                 String localName,

                                 boolean isId)

                                 throws DOMException;

    /**

     *  If the parameter <code>isId</code> is <code>true</code>, this method

     * declares the specified attribute to be a user-determined ID attribute

     * . This affects the value of <code>Attr.isId</code> and the behavior

     * of <code>Document.getElementById</code>, but does not change any

     * schema that may be in use, in particular this does not affect the

     * <code>Attr.schemaTypeInfo</code> of the specified <code>Attr</code>

     * node. Use the value <code>false</code> for the parameter

     * <code>isId</code> to undeclare an attribute for being a

     * user-determined ID attribute.

     * @param idAttr The attribute node.

     * @param isId Whether the attribute is a of type ID.

     * @exception DOMException

     *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

     *   <br>NOT_FOUND_ERR: Raised if the specified node is not an attribute

     *   of this element.

     * @since 1.5, DOM Level 3

     */

    public void setIdAttributeNode(Attr idAttr,

                                   boolean isId)

                                   throws DOMException;

}