2 * Copyright (c) 2000 World Wide Web Consortium,
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3 * (Massachusetts Institute of Technology, Institut National de
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4 * Recherche en Informatique et en Automatique, Keio University). All
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5 * Rights Reserved. This program is distributed under the W3C's Software
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6 * Intellectual Property License. This program is distributed in the
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7 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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8 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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10 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
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13 package org.w3c.dom;
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16 * The <code>Element</code> interface represents an element in an HTML or XML
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17 * document. Elements may have attributes associated with them; since the
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18 * <code>Element</code> interface inherits from <code>Node</code>, the
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19 * generic <code>Node</code> interface attribute <code>attributes</code> may
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20 * be used to retrieve the set of all attributes for an element. There are
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21 * methods on the <code>Element</code> interface to retrieve either an
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22 * <code>Attr</code> object by name or an attribute value by name. In XML,
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23 * where an attribute value may contain entity references, an
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24 * <code>Attr</code> object should be retrieved to examine the possibly
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25 * fairly complex sub-tree representing the attribute value. On the other
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26 * hand, in HTML, where all attributes have simple string values, methods to
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27 * directly access an attribute value can safely be used as a convenience.In
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28 * DOM Level 2, the method <code>normalize</code> is inherited from the
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29 * <code>Node</code> interface where it was moved.
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30 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113'>Document Object Model (DOM) Level 2 Core Specification</a>.
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32 public interface Element extends Node {
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34 * The name of the element. For example, in:
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35 * <pre> <elementExample
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36 * id="demo"> ... </elementExample> , </pre>
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37 * <code>tagName</code> has
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38 * the value <code>"elementExample"</code>. Note that this is
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39 * case-preserving in XML, as are all of the operations of the DOM. The
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40 * HTML DOM returns the <code>tagName</code> of an HTML element in the
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41 * canonical uppercase form, regardless of the case in the source HTML
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44 public String getTagName();
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47 * Retrieves an attribute value by name.
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48 * @param nameThe name of the attribute to retrieve.
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49 * @return The <code>Attr</code> value as a string, or the empty string
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50 * if that attribute does not have a specified or default value.
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52 public String getAttribute(String name);
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55 * Adds a new attribute. If an attribute with that name is already present
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56 * in the element, its value is changed to be that of the value
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57 * parameter. This value is a simple string; it is not parsed as it is
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58 * being set. So any markup (such as syntax to be recognized as an
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59 * entity reference) is treated as literal text, and needs to be
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60 * appropriately escaped by the implementation when it is written out.
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61 * In order to assign an attribute value that contains entity
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62 * references, the user must create an <code>Attr</code> node plus any
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63 * <code>Text</code> and <code>EntityReference</code> nodes, build the
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64 * appropriate subtree, and use <code>setAttributeNode</code> to assign
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65 * it as the value of an attribute.
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66 * <br>To set an attribute with a qualified name and namespace URI, use
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67 * the <code>setAttributeNS</code> method.
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68 * @param nameThe name of the attribute to create or alter.
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69 * @param valueValue to set in string form.
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70 * @exception DOMException
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71 * INVALID_CHARACTER_ERR: Raised if the specified name contains an
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72 * illegal character.
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73 * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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75 public void setAttribute(String name,
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77 throws DOMException;
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80 * Removes an attribute by name. If the removed attribute is known to have
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81 * a default value, an attribute immediately appears containing the
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82 * default value as well as the corresponding namespace URI, local name,
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83 * and prefix when applicable.
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84 * <br>To remove an attribute by local name and namespace URI, use the
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85 * <code>removeAttributeNS</code> method.
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86 * @param nameThe name of the attribute to remove.
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87 * @exception DOMException
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88 * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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90 public void removeAttribute(String name)
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91 throws DOMException;
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94 * Retrieves an attribute node by name.
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95 * <br>To retrieve an attribute node by qualified name and namespace URI,
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96 * use the <code>getAttributeNodeNS</code> method.
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97 * @param nameThe name (<code>nodeName</code>) of the attribute to
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99 * @return The <code>Attr</code> node with the specified name (
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100 * <code>nodeName</code>) or <code>null</code> if there is no such
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103 public Attr getAttributeNode(String name);
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106 * Adds a new attribute node. If an attribute with that name (
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107 * <code>nodeName</code>) is already present in the element, it is
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108 * replaced by the new one.
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109 * <br>To add a new attribute node with a qualified name and namespace
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110 * URI, use the <code>setAttributeNodeNS</code> method.
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111 * @param newAttrThe <code>Attr</code> node to add to the attribute list.
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112 * @return If the <code>newAttr</code> attribute replaces an existing
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113 * attribute, the replaced <code>Attr</code> node is returned,
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114 * otherwise <code>null</code> is returned.
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115 * @exception DOMException
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116 * WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a
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117 * different document than the one that created the element.
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118 * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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119 * <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an
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120 * attribute of another <code>Element</code> object. The DOM user must
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121 * explicitly clone <code>Attr</code> nodes to re-use them in other
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124 public Attr setAttributeNode(Attr newAttr)
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125 throws DOMException;
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128 * Removes the specified attribute node. If the removed <code>Attr</code>
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129 * has a default value it is immediately replaced. The replacing
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130 * attribute has the same namespace URI and local name, as well as the
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131 * original prefix, when applicable.
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132 * @param oldAttrThe <code>Attr</code> node to remove from the attribute
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134 * @return The <code>Attr</code> node that was removed.
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135 * @exception DOMException
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136 * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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137 * <br>NOT_FOUND_ERR: Raised if <code>oldAttr</code> is not an attribute
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140 public Attr removeAttributeNode(Attr oldAttr)
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141 throws DOMException;
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144 * Returns a <code>NodeList</code> of all descendant <code>Elements</code>
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145 * with a given tag name, in the order in which they are encountered in
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146 * a preorder traversal of this <code>Element</code> tree.
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147 * @param nameThe name of the tag to match on. The special value "*"
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148 * matches all tags.
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149 * @return A list of matching <code>Element</code> nodes.
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151 public NodeList getElementsByTagName(String name);
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154 * Retrieves an attribute value by local name and namespace URI. HTML-only
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155 * DOM implementations do not need to implement this method.
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156 * @param namespaceURIThe namespace URI of the attribute to retrieve.
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157 * @param localNameThe local name of the attribute to retrieve.
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158 * @return The <code>Attr</code> value as a string, or the empty string
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159 * if that attribute does not have a specified or default value.
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160 * @since DOM Level 2
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162 public String getAttributeNS(String namespaceURI,
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166 * Adds a new attribute. If an attribute with the same local name and
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167 * namespace URI is already present on the element, its prefix is
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168 * changed to be the prefix part of the <code>qualifiedName</code>, and
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169 * its value is changed to be the <code>value</code> parameter. This
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170 * value is a simple string; it is not parsed as it is being set. So any
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171 * markup (such as syntax to be recognized as an entity reference) is
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172 * treated as literal text, and needs to be appropriately escaped by the
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173 * implementation when it is written out. In order to assign an
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174 * attribute value that contains entity references, the user must create
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175 * an <code>Attr</code> node plus any <code>Text</code> and
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176 * <code>EntityReference</code> nodes, build the appropriate subtree,
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177 * and use <code>setAttributeNodeNS</code> or
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178 * <code>setAttributeNode</code> to assign it as the value of an
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180 * <br>HTML-only DOM implementations do not need to implement this method.
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181 * @param namespaceURIThe namespace URI of the attribute to create or
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183 * @param qualifiedNameThe qualified name of the attribute to create or
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185 * @param valueThe value to set in string form.
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186 * @exception DOMException
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187 * INVALID_CHARACTER_ERR: Raised if the specified qualified name
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188 * contains an illegal character.
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189 * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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190 * <br>NAMESPACE_ERR: Raised if the <code>qualifiedName</code> is
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191 * malformed, if the <code>qualifiedName</code> has a prefix and the
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192 * <code>namespaceURI</code> is <code>null</code>, if the
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193 * <code>qualifiedName</code> has a prefix that is "xml" and the
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194 * <code>namespaceURI</code> is different from "
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195 * http://www.w3.org/XML/1998/namespace", or if the
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196 * <code>qualifiedName</code> is "xmlns" and the
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197 * <code>namespaceURI</code> is different from "
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198 * http://www.w3.org/2000/xmlns/".
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199 * @since DOM Level 2
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201 public void setAttributeNS(String namespaceURI,
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202 String qualifiedName,
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204 throws DOMException;
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207 * Removes an attribute by local name and namespace URI. If the removed
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208 * attribute has a default value it is immediately replaced. The
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209 * replacing attribute has the same namespace URI and local name, as
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210 * well as the original prefix.
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211 * <br>HTML-only DOM implementations do not need to implement this method.
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212 * @param namespaceURIThe namespace URI of the attribute to remove.
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213 * @param localNameThe local name of the attribute to remove.
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214 * @exception DOMException
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215 * NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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216 * @since DOM Level 2
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218 public void removeAttributeNS(String namespaceURI,
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220 throws DOMException;
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223 * Retrieves an <code>Attr</code> node by local name and namespace URI.
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224 * HTML-only DOM implementations do not need to implement this method.
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225 * @param namespaceURIThe namespace URI of the attribute to retrieve.
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226 * @param localNameThe local name of the attribute to retrieve.
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227 * @return The <code>Attr</code> node with the specified attribute local
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228 * name and namespace URI or <code>null</code> if there is no such
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230 * @since DOM Level 2
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232 public Attr getAttributeNodeNS(String namespaceURI,
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236 * Adds a new attribute. If an attribute with that local name and that
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237 * namespace URI is already present in the element, it is replaced by
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239 * <br>HTML-only DOM implementations do not need to implement this method.
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240 * @param newAttrThe <code>Attr</code> node to add to the attribute list.
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241 * @return If the <code>newAttr</code> attribute replaces an existing
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242 * attribute with the same local name and namespace URI, the replaced
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243 * <code>Attr</code> node is returned, otherwise <code>null</code> is
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245 * @exception DOMException
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246 * WRONG_DOCUMENT_ERR: Raised if <code>newAttr</code> was created from a
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247 * different document than the one that created the element.
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248 * <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
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249 * <br>INUSE_ATTRIBUTE_ERR: Raised if <code>newAttr</code> is already an
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250 * attribute of another <code>Element</code> object. The DOM user must
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251 * explicitly clone <code>Attr</code> nodes to re-use them in other
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253 * @since DOM Level 2
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255 public Attr setAttributeNodeNS(Attr newAttr)
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256 throws DOMException;
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259 * Returns a <code>NodeList</code> of all the descendant
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260 * <code>Elements</code> with a given local name and namespace URI in
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261 * the order in which they are encountered in a preorder traversal of
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262 * this <code>Element</code> tree.
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263 * <br>HTML-only DOM implementations do not need to implement this method.
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264 * @param namespaceURIThe namespace URI of the elements to match on. The
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265 * special value "*" matches all namespaces.
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266 * @param localNameThe local name of the elements to match on. The
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267 * special value "*" matches all local names.
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268 * @return A new <code>NodeList</code> object containing all the matched
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269 * <code>Elements</code>.
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270 * @since DOM Level 2
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272 public NodeList getElementsByTagNameNS(String namespaceURI,
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276 * Returns <code>true</code> when an attribute with a given name is
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277 * specified on this element or has a default value, <code>false</code>
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279 * @param nameThe name of the attribute to look for.
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280 * @return <code>true</code> if an attribute with the given name is
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281 * specified on this element or has a default value, <code>false</code>
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283 * @since DOM Level 2
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285 public boolean hasAttribute(String name);
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288 * Returns <code>true</code> when an attribute with a given local name and
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289 * namespace URI is specified on this element or has a default value,
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290 * <code>false</code> otherwise. HTML-only DOM implementations do not
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291 * need to implement this method.
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292 * @param namespaceURIThe namespace URI of the attribute to look for.
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293 * @param localNameThe local name of the attribute to look for.
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294 * @return <code>true</code> if an attribute with the given local name
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295 * and namespace URI is specified or has a default value on this
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296 * element, <code>false</code> otherwise.
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297 * @since DOM Level 2
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299 public boolean hasAttributeNS(String namespaceURI,
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