Source Code Cross Referenced for Attr.java in  » Web-Server » Rimfaxe-Web-Server » org » w3c » dom » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » org.w3c.dom 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2000 World Wide Web Consortium,
003:         * (Massachusetts Institute of Technology, Institut National de
004:         * Recherche en Informatique et en Automatique, Keio University). All
005:         * Rights Reserved. This program is distributed under the W3C's Software
006:         * Intellectual Property License. This program is distributed in the
007:         * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
008:         * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
009:         * PURPOSE.
010:         * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
011:         */
012:
013:        package org.w3c.dom;
014:
015:        /**
016:         * The <code>Attr</code> interface represents an attribute in an 
017:         * <code>Element</code> object. Typically the allowable values for the 
018:         * attribute are defined in a document type definition.
019:         * <p><code>Attr</code> objects inherit the <code>Node</code> interface, but 
020:         * since they are not actually child nodes of the element they describe, the 
021:         * DOM does not consider them part of the document tree. Thus, the 
022:         * <code>Node</code> attributes <code>parentNode</code>, 
023:         * <code>previousSibling</code>, and <code>nextSibling</code> have a 
024:         * <code>null</code> value for <code>Attr</code> objects. The DOM takes the 
025:         * view that attributes are properties of elements rather than having a 
026:         * separate identity from the elements they are associated with; this should 
027:         * make it more efficient to implement such features as default attributes 
028:         * associated with all elements of a given type. Furthermore, 
029:         * <code>Attr</code> nodes may not be immediate children of a 
030:         * <code>DocumentFragment</code>. However, they can be associated with 
031:         * <code>Element</code> nodes contained within a 
032:         * <code>DocumentFragment</code>. In short, users and implementors of the 
033:         * DOM need to be aware that <code>Attr</code> nodes have some things in 
034:         * common with other objects inheriting the <code>Node</code> interface, but 
035:         * they also are quite distinct.
036:         * <p>The attribute's effective value is determined as follows: if this 
037:         * attribute has been explicitly assigned any value, that value is the 
038:         * attribute's effective value; otherwise, if there is a declaration for 
039:         * this attribute, and that declaration includes a default value, then that 
040:         * default value is the attribute's effective value; otherwise, the 
041:         * attribute does not exist on this element in the structure model until it 
042:         * has been explicitly added. Note that the <code>nodeValue</code> attribute 
043:         * on the <code>Attr</code> instance can also be used to retrieve the string 
044:         * version of the attribute's value(s).
045:         * <p>In XML, where the value of an attribute can contain entity references, 
046:         * the child nodes of the <code>Attr</code> node may be either 
047:         * <code>Text</code> or <code>EntityReference</code> nodes (when these are 
048:         * in use; see the description of <code>EntityReference</code> for 
049:         * discussion). Because the DOM Core is not aware of attribute types, it 
050:         * treats all attribute values as simple strings, even if the DTD or schema 
051:         * declares them as having tokenized types.
052:         * <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>.
053:         */
054:        public interface Attr extends Node {
055:            /**
056:             * Returns the name of this attribute.
057:             */
058:            public String getName();
059:
060:            /**
061:             * If this attribute was explicitly given a value in the original 
062:             * document, this is <code>true</code>; otherwise, it is 
063:             * <code>false</code>. Note that the implementation is in charge of this 
064:             * attribute, not the user. If the user changes the value of the 
065:             * attribute (even if it ends up having the same value as the default 
066:             * value) then the <code>specified</code> flag is automatically flipped 
067:             * to <code>true</code>. To re-specify the attribute as the default 
068:             * value from the DTD, the user must delete the attribute. The 
069:             * implementation will then make a new attribute available with 
070:             * <code>specified</code> set to <code>false</code> and the default 
071:             * value (if one exists).
072:             * <br>In summary: If the attribute has an assigned value in the document 
073:             * then <code>specified</code> is <code>true</code>, and the value is 
074:             * the assigned value.If the attribute has no assigned value in the 
075:             * document and has a default value in the DTD, then 
076:             * <code>specified</code> is <code>false</code>, and the value is the 
077:             * default value in the DTD.If the attribute has no assigned value in 
078:             * the document and has a value of #IMPLIED in the DTD, then the 
079:             * attribute does not appear in the structure model of the document.If 
080:             * the <code>ownerElement</code> attribute is <code>null</code> (i.e. 
081:             * because it was just created or was set to <code>null</code> by the 
082:             * various removal and cloning operations) <code>specified</code> is 
083:             * <code>true</code>. 
084:             */
085:            public boolean getSpecified();
086:
087:            /**
088:             * On retrieval, the value of the attribute is returned as a string. 
089:             * Character and general entity references are replaced with their 
090:             * values. See also the method <code>getAttribute</code> on the 
091:             * <code>Element</code> interface.
092:             * <br>On setting, this creates a <code>Text</code> node with the unparsed 
093:             * contents of the string. I.e. any characters that an XML processor 
094:             * would recognize as markup are instead treated as literal text. See 
095:             * also the method <code>setAttribute</code> on the <code>Element</code> 
096:             * interface.
097:             * @exception DOMException
098:             *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
099:             */
100:            public String getValue();
101:
102:            /**
103:             * On retrieval, the value of the attribute is returned as a string. 
104:             * Character and general entity references are replaced with their 
105:             * values. See also the method <code>getAttribute</code> on the 
106:             * <code>Element</code> interface.
107:             * <br>On setting, this creates a <code>Text</code> node with the unparsed 
108:             * contents of the string. I.e. any characters that an XML processor 
109:             * would recognize as markup are instead treated as literal text. See 
110:             * also the method <code>setAttribute</code> on the <code>Element</code> 
111:             * interface.
112:             * @exception DOMException
113:             *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
114:             */
115:            public void setValue(String value) throws DOMException;
116:
117:            /**
118:             * The <code>Element</code> node this attribute is attached to or 
119:             * <code>null</code> if this attribute is not in use.
120:             * @since DOM Level 2
121:             */
122:            public Element getOwnerElement();
123:
124:        }
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