author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 18 Jan 2010 20:28:24 +0200 | |
changeset 2 | 661f3784fe57 |
parent 1 | c42dffbd5b4f |
permissions | -rw-r--r-- |
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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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/* |
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* $Id: DOM_Element.hpp 568078 2007-08-21 11:43:25Z amassari $ |
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*/ |
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#ifndef DOM_Element_HEADER_GUARD_ |
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#define DOM_Element_HEADER_GUARD_ |
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#include <xercesc/util/XercesDefs.hpp> |
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#include "DOM_Node.hpp" |
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|
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XERCES_CPP_NAMESPACE_BEGIN |
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class DOM_Attr; |
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class DOM_NodeList; |
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class ElementImpl; |
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|
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/** |
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* By far the vast majority of objects (apart from text) that authors |
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* encounter when traversing a document are <code>DOM_Element</code> nodes. |
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* |
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* Assume the following XML document:<elementExample id="demo"> |
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* <subelement1/> |
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* <subelement2><subsubelement/></subelement2> |
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* </elementExample> |
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* <p>When represented using DOM, the top node is an <code>DOM_Element</code> node |
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* for "elementExample", which contains two child <code>DOM_Element</code> nodes, |
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* one for "subelement1" and one for "subelement2". "subelement1" contains no |
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* child nodes. |
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* <p>Elements may have attributes associated with them; since the |
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* <code>DOM_Element</code> interface inherits from <code>DOM_Node</code>, the generic |
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* <code>DOM_Node</code> interface method <code>getAttributes</code> may be used |
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* to retrieve the set of all attributes for an element. There are methods on |
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* the <code>DOM_Element</code> interface to retrieve either an <code>DOM_Attr</code> |
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* object by name or an attribute value by name. In XML, where an attribute |
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* value may contain entity references, an <code>DOM_Attr</code> object should be |
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* retrieved to examine the possibly fairly complex sub-tree representing the |
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* attribute value. On the other hand, in HTML, where all attributes have |
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* simple string values, methods to directly access an attribute value can |
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* safely be used as a convenience. |
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*/ |
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|
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class DEPRECATED_DOM_EXPORT DOM_Element: public DOM_Node { |
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private: |
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|
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public: |
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/** @name Constructors and assignment operator */ |
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//@{ |
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/** |
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* Default constructor for DOM_Element. The resulting object does not |
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* refer to an actual Element node; it will compare == to 0, and is similar |
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* to a null object reference variable in Java. It may subsequently be |
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* assigned to refer to an actual Element node. |
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* <p> |
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* New comment nodes are created by DOM_Document::createElement(). |
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* |
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*/ |
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DOM_Element(); |
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|
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/** |
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* Copy constructor. Creates a new <code>DOM_Element</code> that refers to the |
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* same underlying actual element as the original. |
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* |
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* @param other The object to be copied |
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*/ |
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DOM_Element(const DOM_Element &other); |
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|
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/** |
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* Assignment operator. |
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* |
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* @param other The object to be copied. |
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*/ |
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DOM_Element & operator = (const DOM_Element &other); |
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|
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/** |
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* Assignment operator. This overloaded variant is provided for |
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* the sole purpose of setting a DOM_Node reference variable to |
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* zero. Nulling out a reference variable in this way will decrement |
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* the reference count on the underlying Node object that the variable |
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* formerly referenced. This effect is normally obtained when reference |
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* variable goes out of scope, but zeroing them can be useful for |
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* global instances, or for local instances that will remain in scope |
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* for an extended time, when the storage belonging to the underlying |
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* node needs to be reclaimed. |
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* |
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* @param val Only a value of 0, or null, is allowed. |
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*/ |
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DOM_Element & operator = (const DOM_NullPtr *val); |
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106 |
|
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//@} |
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/** @name Destructor. */ |
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109 |
//@{ |
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/** |
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* Destructor. The object being destroyed is the reference |
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* object, not the underlying Element itself. |
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* |
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*/ |
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~DOM_Element(); |
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//@} |
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/** @name Getter functions. */ |
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118 |
//@{ |
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119 |
|
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/** |
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* The name of the element. |
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* |
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* For example, in: <elementExample |
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* id="demo"> ... </elementExample> , <code>tagName</code> has |
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* the value <code>"elementExample"</code>. Note that this is |
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* case-preserving in XML, as are all of the operations of the DOM. |
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*/ |
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DOMString getTagName() const; |
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129 |
|
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/** |
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* Retrieves an attribute value by name. |
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* |
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* @param name The name of the attribute to retrieve. |
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* @return The <code>DOM_Attr</code> value as a string, or the empty string if |
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* that attribute does not have a specified or default value. |
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*/ |
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DOMString getAttribute(const DOMString &name) const; |
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138 |
|
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/** |
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* Retrieves an <code>DOM_Attr</code> node by name. |
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* |
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* @param name The name (<CODE>nodeName</CODE>) of the attribute to retrieve. |
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* @return The <code>DOM_Attr</code> node with the specified name (<CODE>nodeName</CODE>) or |
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* <code>null</code> if there is no such attribute. |
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*/ |
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DOM_Attr getAttributeNode(const DOMString &name) const; |
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|
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/** |
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* Returns a <code>NodeList</code> of all descendant elements with a given |
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* tag name, in the order in which they would be encountered in a preorder |
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* traversal of the <code>DOM_Element</code> tree. |
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* |
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* @param name The name of the tag to match on. The special value "*" |
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* matches all tags. |
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* @return A list of matching <code>DOM_Element</code> nodes. |
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*/ |
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DOM_NodeList getElementsByTagName(const DOMString &name) const; |
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158 |
|
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//@} |
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/** @name Set functions. */ |
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//@{ |
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162 |
|
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/** |
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* Adds a new attribute. |
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* |
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* If an attribute with that name is already present |
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* in the element, its value is changed to be that of the value parameter. |
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* This value is a simple string, it is not parsed as it is being set. So |
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* any markup (such as syntax to be recognized as an entity reference) is |
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* treated as literal text, and needs to be appropriately escaped by the |
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* implementation when it is written out. In order to assign an attribute |
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* value that contains entity references, the user must create an |
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* <code>DOM_Attr</code> node plus any <code>Text</code> and |
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* <code>EntityReference</code> nodes, build the appropriate subtree, and |
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* use <code>setAttributeNode</code> to assign it as the value of an |
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* attribute. |
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* @param name The name of the attribute to create or alter. |
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* @param value Value to set in string form. |
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* @exception DOMException |
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* INVALID_CHARACTER_ERR: Raised if the specified name contains an |
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* illegal character. |
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* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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*/ |
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void setAttribute(const DOMString &name, |
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const DOMString &value); |
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/** |
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* Adds a new attribute. |
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* |
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* If an attribute with that name (<CODE>nodeName</CODE>) is already present |
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* in the element, it is replaced by the new one. |
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* @param newAttr The <code>DOM_Attr</code> node to add to the attribute list. |
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* @return If the <code>newAttr</code> attribute replaces an existing |
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* attribute, the replaced |
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* <code>DOM_Attr</code> node is returned, otherwise <code>null</code> is |
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* returned. |
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* @exception DOMException |
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* WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a |
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* different document than the one that created the element. |
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* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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* <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an |
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* attribute of another <code>DOM_Element</code> object. The DOM user must |
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* explicitly clone <code>DOM_Attr</code> nodes to re-use them in other |
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* elements. |
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*/ |
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DOM_Attr setAttributeNode(DOM_Attr newAttr); |
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|
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//@} |
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/** @name Functions which modify the Element. */ |
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//@{ |
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/** |
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* Removes the specified attribute node. |
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* If the removed <CODE>DOM_Attr</CODE> |
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* has a default value it is immediately replaced. The replacing attribute |
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* has the same namespace URI and local name, as well as the original prefix, |
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* when applicable. |
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* |
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* @param oldAttr The <code>DOM_Attr</code> node to remove from the attribute |
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* list. |
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* @return The <code>DOM_Attr</code> node that was removed. |
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* @exception DOMException |
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* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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* <br>NOT_FOUND_ERR: Raised if <code>oldAttr</code> is not an attribute |
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* of the element. |
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*/ |
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DOM_Attr removeAttributeNode(DOM_Attr oldAttr); |
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|
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/** |
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* Removes an attribute by name. |
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* |
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* If the removed attribute |
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* is known to have a default value, an attribute immediately appears |
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* containing the default value as well as the corresponding namespace URI, |
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* local name, and prefix when applicable.<BR>To remove an attribute by local |
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* name and namespace URI, use the <CODE>removeAttributeNS</CODE> method. |
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* @param name The name of the attribute to remove. |
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* @exception DOMException |
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* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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*/ |
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void removeAttribute(const DOMString &name); |
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|
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//@} |
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/** @name Functions introduced in DOM Level 2. */ |
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//@{ |
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|
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/** |
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* Retrieves an attribute value by local name and namespace URI. |
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* |
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* @param namespaceURI The <em>namespace URI</em> of |
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* the attribute to retrieve. |
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* @param localName The <em>local name</em> of the |
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* attribute to retrieve. |
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* @return The <code>DOM_Attr</code> value as a string, or an <CODE>null</CODE> if |
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* that attribute does not have a specified or default value. |
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*/ |
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DOMString getAttributeNS(const DOMString &namespaceURI, |
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const DOMString &localName) const; |
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|
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/** |
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* Adds a new attribute. If an attribute with the same |
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* local name and namespace URI is already present on the element, its prefix |
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* is changed to be the prefix part of the <CODE>qualifiedName</CODE>, and |
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* its value is changed to be the <CODE>value</CODE> parameter. This value is |
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* a simple string, it is not parsed as it is being set. So any markup (such |
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* as syntax to be recognized as an entity reference) is treated as literal |
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* text, and needs to be appropriately escaped by the implementation when it |
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* is written out. In order to assign an attribute value that contains entity |
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* references, the user must create an <CODE>DOM_Attr</CODE> |
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* node plus any <CODE>DOM_Text</CODE> and <CODE>DOM_EntityReference</CODE> |
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* nodes, build the appropriate subtree, and use |
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* <CODE>setAttributeNodeNS</CODE> or <CODE>setAttributeNode</CODE> to assign |
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* it as the value of an attribute. |
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* |
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* @param namespaceURI The <em>namespace URI</em> of |
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* the attribute to create or alter. |
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* @param qualifiedName The <em>qualified name</em> of the |
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* attribute to create or alter. |
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* @param value The value to set in string form. |
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* @exception DOMException |
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* INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an |
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* illegal character. |
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* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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* <br> |
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* NAMESPACE_ERR: Raised if the <CODE>qualifiedName</CODE> is |
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* malformed, if the <CODE>qualifiedName</CODE> has a prefix and the |
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* <CODE>namespaceURI</CODE> is <CODE>null</CODE> or an empty string, |
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* if the <CODE>qualifiedName</CODE> has a prefix that is "xml" and the |
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* <CODE>namespaceURI</CODE> is different from |
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* "http://www.w3.org/XML/1998/namespace", if the |
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* <CODE>qualifiedName</CODE> has a prefix that is "xmlns" and the |
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* <CODE>namespaceURI</CODE> is different from |
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* "http://www.w3.org/2000/xmlns/", or if the |
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* <CODE>qualifiedName</CODE> is "xmlns" and the |
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* <CODE>namespaceURI</CODE> is different from |
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* "http://www.w3.org/2000/xmlns/". |
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*/ |
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void setAttributeNS(const DOMString &namespaceURI, |
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const DOMString &qualifiedName, const DOMString &value); |
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|
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/** |
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* Removes an attribute by local name and namespace URI. If the |
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* removed attribute has a default value it is immediately replaced. |
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* The replacing attribute has the same namespace URI and local name, as well as |
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* the original prefix. |
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* |
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* @param namespaceURI The <em>namespace URI</em> of |
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* the attribute to remove. |
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* @param localName The <em>local name</em> of the |
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* attribute to remove. |
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* @exception DOMException |
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* NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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*/ |
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void removeAttributeNS(const DOMString &namespaceURI, |
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const DOMString &localName); |
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314 |
|
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/** |
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* Retrieves an <code>DOM_Attr</code> node by local name and namespace URI. |
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* |
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* @param namespaceURI The <em>namespace URI</em> of |
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* the attribute to retrieve. |
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* @param localName The <em>local name</em> of the |
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* attribute to retrieve. |
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* @return The <code>DOM_Attr</code> node with the specified attribute local |
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* name and namespace URI or <code>null</code> if there is no such attribute. |
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*/ |
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DOM_Attr getAttributeNodeNS(const DOMString &namespaceURI, |
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const DOMString &localName) const; |
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327 |
|
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/** |
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* Adds a new attribute. |
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* |
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* If an attribute with that local name and namespace URI is already present |
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* in the element, it is replaced by the new one. |
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* |
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* @param newAttr The <code>DOM_Attr</code> node to add to the attribute list. |
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* @return If the <code>newAttr</code> attribute replaces an existing |
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* attribute with the same <em>local name</em> and <em>namespace URI</em>, |
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* the replaced <code>DOM_Attr</code> node is |
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* returned, otherwise <code>null</code> is returned. |
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* @exception DOMException |
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* WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a |
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* different document than the one that created the element. |
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* <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. |
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* <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an |
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* attribute of another <code>DOM_Element</code> object. The DOM user must |
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* explicitly clone <code>DOM_Attr</code> nodes to re-use them in other |
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* elements. |
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*/ |
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DOM_Attr setAttributeNodeNS(DOM_Attr newAttr); |
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|
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/** |
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* Returns a <code>DOM_NodeList</code> of all the <code>DOM_Element</code>s |
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* with a given local name and namespace URI in the order in which they |
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* would be encountered in a preorder traversal of the |
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* <code>DOM_Document</code> tree, starting from this node. |
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* |
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* @param namespaceURI The <em>namespace URI</em> of |
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* the elements to match on. The special value "*" matches all |
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* namespaces. |
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* @param localName The <em>local name</em> of the |
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* elements to match on. The special value "*" matches all local names. |
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* @return A new <code>DOM_NodeList</code> object containing all the matched |
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* <code>DOM_Element</code>s. |
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*/ |
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DOM_NodeList getElementsByTagNameNS(const DOMString &namespaceURI, |
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const DOMString &localName) const; |
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366 |
|
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/** |
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* Returns whether this node (if it is an element) has any attributes. |
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* @return <code>true</code> if this node has any attributes, |
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* <code>false</code> otherwise. |
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*/ |
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bool hasAttributes() const; |
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|
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/** |
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* Returns <code>true</code> when an attribute with a given name is |
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* specified on this element or has a default value, <code>false</code> |
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* otherwise. |
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* @param name The name of the attribute to look for. |
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* @return <code>true</code> if an attribute with the given name is |
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* specified on this element or has a default value, <code>false</code> |
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* otherwise. |
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*/ |
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bool hasAttribute(const DOMString &name) const; |
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|
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/** |
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* Returns <code>true</code> when an attribute with a given local name and |
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* namespace URI is specified on this element or has a default value, |
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* <code>false</code> otherwise. HTML-only DOM implementations do not |
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* need to implement this method. |
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* @param namespaceURI The namespace URI of the attribute to look for. |
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* @param localName The local name of the attribute to look for. |
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* @return <code>true</code> if an attribute with the given local name |
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* and namespace URI is specified or has a default value on this |
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* element, <code>false</code> otherwise. |
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* @since DOM Level 2 |
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*/ |
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bool hasAttributeNS(const DOMString &namespaceURI, |
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const DOMString &localName) const; |
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399 |
|
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//@} |
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401 |
|
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402 |
protected: |
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DOM_Element(ElementImpl *impl); |
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friend class DOM_Document; |
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friend class DOM_Attr; |
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}; |
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XERCES_CPP_NAMESPACE_END |
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#endif |
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