org.w3c.dom
Interface Attr

All Superinterfaces:
Node sample code for org.w3c.dom.Node definition code for org.w3c.dom.Node

public interface Attr
extends Node sample code for org.w3c.dom.Node definition code for org.w3c.dom.Node

The Attr interface represents an attribute in an Element object. Typically the allowable values for the attribute are defined in a schema associated with the document.

Attr objects inherit the Node interface, but since they are not actually child nodes of the element they describe, the DOM does not consider them part of the document tree. Thus, the Node attributes parentNode, previousSibling, and nextSibling have a null value for Attr objects. The DOM takes the view that attributes are properties of elements rather than having a separate identity from the elements they are associated with; this should make it more efficient to implement such features as default attributes associated with all elements of a given type. Furthermore, Attr nodes may not be immediate children of a DocumentFragment. However, they can be associated with Element nodes contained within a DocumentFragment. In short, users and implementors of the DOM need to be aware that Attr nodes have some things in common with other objects inheriting the Node interface, but they also are quite distinct.

The attribute's effective value is determined as follows: if this attribute has been explicitly assigned any value, that value is the attribute's effective value; otherwise, if there is a declaration for this attribute, and that declaration includes a default value, then that default value is the attribute's effective value; otherwise, the attribute does not exist on this element in the structure model until it has been explicitly added. Note that the Node.nodeValue attribute on the Attr instance can also be used to retrieve the string version of the attribute's value(s).

If the attribute was not explicitly given a value in the instance document but has a default value provided by the schema associated with the document, an attribute node will be created with specified set to false. Removing attribute nodes for which a default value is defined in the schema generates a new attribute node with the default value and specified set to false. If validation occurred while invoking Document.normalizeDocument(), attribute nodes with specified equals to false are recomputed according to the default attribute values provided by the schema. If no default value is associate with this attribute in the schema, the attribute node is discarded.

In XML, where the value of an attribute can contain entity references, the child nodes of the Attr node may be either Text or EntityReference nodes (when these are in use; see the description of EntityReference for discussion).

The DOM Core represents all attribute values as simple strings, even if the DTD or schema associated with the document declares them of some specific type such as tokenized.

The way attribute value normalization is performed by the DOM implementation depends on how much the implementation knows about the schema in use. Typically, the value and nodeValue attributes of an Attr node initially returns the normalized value given by the parser. It is also the case after Document.normalizeDocument() is called (assuming the right options have been set). But this may not be the case after mutation, independently of whether the mutation is performed by setting the string value directly or by changing the Attr child nodes. In particular, this is true when character references are involved, given that they are not represented in the DOM and they impact attribute value normalization. On the other hand, if the implementation knows about the schema in use when the attribute value is changed, and it is of a different type than CDATA, it may normalize it again at that time. This is especially true of specialized DOM implementations, such as SVG DOM implementations, which store attribute values in an internal form different from a string.

The following table gives some examples of the relations between the attribute value in the original document (parsed attribute), the value as exposed in the DOM, and the serialization of the value:

Examples Parsed attribute value Initial Attr.value Serialized attribute value
Character reference
"x²=5"
"x²=5"
"x²=5"
Built-in character entity
"y<6"
"y<6"
"y&lt;6"
Literal newline between
 "x=5&#10;y=6"
"x=5 y=6"
"x=5&#10;y=6"
Normalized newline between
"x=5 
 y=6"
"x=5 y=6"
"x=5 y=6"
Entity e with literal newline
 <!ENTITY e '...&#10;...'> [...]> "x=5&e;y=6"
Dependent on Implementation and Load Options Dependent on Implementation and Load/Save Options

See also the Document Object Model (DOM) Level 3 Core Specification.


Field Summary
 
Fields inherited from interface org.w3c.dom.Node sample code for org.w3c.dom.Node definition code for org.w3c.dom.Node
ATTRIBUTE_NODE sample code for org.w3c.dom.Node.ATTRIBUTE_NODE definition code for org.w3c.dom.Node.ATTRIBUTE_NODE , CDATA_SECTION_NODE sample code for org.w3c.dom.Node.CDATA_SECTION_NODE definition code for org.w3c.dom.Node.CDATA_SECTION_NODE , COMMENT_NODE sample code for org.w3c.dom.Node.COMMENT_NODE definition code for org.w3c.dom.Node.COMMENT_NODE , DOCUMENT_FRAGMENT_NODE sample code for org.w3c.dom.Node.DOCUMENT_FRAGMENT_NODE definition code for org.w3c.dom.Node.DOCUMENT_FRAGMENT_NODE , DOCUMENT_NODE sample code for org.w3c.dom.Node.DOCUMENT_NODE definition code for org.w3c.dom.Node.DOCUMENT_NODE , DOCUMENT_POSITION_CONTAINED_BY sample code for org.w3c.dom.Node.DOCUMENT_POSITION_CONTAINED_BY definition code for org.w3c.dom.Node.DOCUMENT_POSITION_CONTAINED_BY , DOCUMENT_POSITION_CONTAINS sample code for org.w3c.dom.Node.DOCUMENT_POSITION_CONTAINS definition code for org.w3c.dom.Node.DOCUMENT_POSITION_CONTAINS , DOCUMENT_POSITION_DISCONNECTED sample code for org.w3c.dom.Node.DOCUMENT_POSITION_DISCONNECTED definition code for org.w3c.dom.Node.DOCUMENT_POSITION_DISCONNECTED , DOCUMENT_POSITION_FOLLOWING sample code for org.w3c.dom.Node.DOCUMENT_POSITION_FOLLOWING definition code for org.w3c.dom.Node.DOCUMENT_POSITION_FOLLOWING , DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC sample code for org.w3c.dom.Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC definition code for org.w3c.dom.Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC , DOCUMENT_POSITION_PRECEDING sample code for org.w3c.dom.Node.DOCUMENT_POSITION_PRECEDING definition code for org.w3c.dom.Node.DOCUMENT_POSITION_PRECEDING , DOCUMENT_TYPE_NODE sample code for org.w3c.dom.Node.DOCUMENT_TYPE_NODE definition code for org.w3c.dom.Node.DOCUMENT_TYPE_NODE , ELEMENT_NODE sample code for org.w3c.dom.Node.ELEMENT_NODE definition code for org.w3c.dom.Node.ELEMENT_NODE , ENTITY_NODE sample code for org.w3c.dom.Node.ENTITY_NODE definition code for org.w3c.dom.Node.ENTITY_NODE , ENTITY_REFERENCE_NODE sample code for org.w3c.dom.Node.ENTITY_REFERENCE_NODE definition code for org.w3c.dom.Node.ENTITY_REFERENCE_NODE , NOTATION_NODE sample code for org.w3c.dom.Node.NOTATION_NODE definition code for org.w3c.dom.Node.NOTATION_NODE , PROCESSING_INSTRUCTION_NODE sample code for org.w3c.dom.Node.PROCESSING_INSTRUCTION_NODE definition code for org.w3c.dom.Node.PROCESSING_INSTRUCTION_NODE , TEXT_NODE sample code for org.w3c.dom.Node.TEXT_NODE definition code for org.w3c.dom.Node.TEXT_NODE
 
Method Summary
 String sample code for java.lang.String definition code for java.lang.String getName sample code for org.w3c.dom.Attr.getName() definition code for org.w3c.dom.Attr.getName() ()
          Returns the name of this attribute.
 Element sample code for org.w3c.dom.Element definition code for org.w3c.dom.Element getOwnerElement sample code for org.w3c.dom.Attr.getOwnerElement() definition code for org.w3c.dom.Attr.getOwnerElement() ()
          The Element node this attribute is attached to or null if this attribute is not in use.
 TypeInfo sample code for org.w3c.dom.TypeInfo definition code for org.w3c.dom.TypeInfo getSchemaTypeInfo sample code for org.w3c.dom.Attr.getSchemaTypeInfo() definition code for org.w3c.dom.Attr.getSchemaTypeInfo() ()
          The type information associated with this attribute.
 boolean getSpecified sample code for org.w3c.dom.Attr.getSpecified() definition code for org.w3c.dom.Attr.getSpecified() ()
          True if this attribute was explicitly given a value in the instance document, false otherwise.
 String sample code for java.lang.String definition code for java.lang.String getValue sample code for org.w3c.dom.Attr.getValue() definition code for org.w3c.dom.Attr.getValue() ()
          On retrieval, the value of the attribute is returned as a string.
 boolean isId sample code for org.w3c.dom.Attr.isId() definition code for org.w3c.dom.Attr.isId() ()
          Returns whether this attribute is known to be of type ID (i.e.
 void setValue sample code for org.w3c.dom.Attr.setValue(java.lang.String) definition code for org.w3c.dom.Attr.setValue(java.lang.String) (String sample code for java.lang.String definition code for java.lang.String  value)
          On retrieval, the value of the attribute is returned as a string.
 
Methods inherited from interface org.w3c.dom.Node sample code for org.w3c.dom.Node definition code for org.w3c.dom.Node
appendChild sample code for org.w3c.dom.Node.appendChild(org.w3c.dom.Node) definition code for org.w3c.dom.Node.appendChild(org.w3c.dom.Node) , cloneNode sample code for org.w3c.dom.Node.cloneNode(boolean) definition code for org.w3c.dom.Node.cloneNode(boolean) , compareDocumentPosition sample code for org.w3c.dom.Node.compareDocumentPosition(org.w3c.dom.Node) definition code for org.w3c.dom.Node.compareDocumentPosition(org.w3c.dom.Node) , getAttributes sample code for org.w3c.dom.Node.getAttributes() definition code for org.w3c.dom.Node.getAttributes() , getBaseURI sample code for org.w3c.dom.Node.getBaseURI() definition code for org.w3c.dom.Node.getBaseURI() , getChildNodes sample code for org.w3c.dom.Node.getChildNodes() definition code for org.w3c.dom.Node.getChildNodes() , getFeature sample code for org.w3c.dom.Node.getFeature(java.lang.String, java.lang.String) definition code for org.w3c.dom.Node.getFeature(java.lang.String, java.lang.String) , getFirstChild sample code for org.w3c.dom.Node.getFirstChild() definition code for org.w3c.dom.Node.getFirstChild() , getLastChild sample code for org.w3c.dom.Node.getLastChild() definition code for org.w3c.dom.Node.getLastChild() , getLocalName sample code for org.w3c.dom.Node.getLocalName() definition code for org.w3c.dom.Node.getLocalName() , getNamespaceURI sample code for org.w3c.dom.Node.getNamespaceURI() definition code for org.w3c.dom.Node.getNamespaceURI() , getNextSibling sample code for org.w3c.dom.Node.getNextSibling() definition code for org.w3c.dom.Node.getNextSibling() , getNodeName sample code for org.w3c.dom.Node.getNodeName() definition code for org.w3c.dom.Node.getNodeName() , getNodeType sample code for org.w3c.dom.Node.getNodeType() definition code for org.w3c.dom.Node.getNodeType() , getNodeValue sample code for org.w3c.dom.Node.getNodeValue() definition code for org.w3c.dom.Node.getNodeValue() , getOwnerDocument sample code for org.w3c.dom.Node.getOwnerDocument() definition code for org.w3c.dom.Node.getOwnerDocument() , getParentNode sample code for org.w3c.dom.Node.getParentNode() definition code for org.w3c.dom.Node.getParentNode() , getPrefix sample code for org.w3c.dom.Node.getPrefix() definition code for org.w3c.dom.Node.getPrefix() , getPreviousSibling sample code for org.w3c.dom.Node.getPreviousSibling() definition code for org.w3c.dom.Node.getPreviousSibling() , getTextContent sample code for org.w3c.dom.Node.getTextContent() definition code for org.w3c.dom.Node.getTextContent() , getUserData sample code for org.w3c.dom.Node.getUserData(java.lang.String) definition code for org.w3c.dom.Node.getUserData(java.lang.String) , hasAttributes sample code for org.w3c.dom.Node.hasAttributes() definition code for org.w3c.dom.Node.hasAttributes() , hasChildNodes sample code for org.w3c.dom.Node.hasChildNodes() definition code for org.w3c.dom.Node.hasChildNodes() , insertBefore sample code for org.w3c.dom.Node.insertBefore(org.w3c.dom.Node, org.w3c.dom.Node) definition code for org.w3c.dom.Node.insertBefore(org.w3c.dom.Node, org.w3c.dom.Node) , isDefaultNamespace sample code for org.w3c.dom.Node.isDefaultNamespace(java.lang.String) definition code for org.w3c.dom.Node.isDefaultNamespace(java.lang.String) , isEqualNode sample code for org.w3c.dom.Node.isEqualNode(org.w3c.dom.Node) definition code for org.w3c.dom.Node.isEqualNode(org.w3c.dom.Node) , isSameNode sample code for org.w3c.dom.Node.isSameNode(org.w3c.dom.Node) definition code for org.w3c.dom.Node.isSameNode(org.w3c.dom.Node) , isSupported sample code for org.w3c.dom.Node.isSupported(java.lang.String, java.lang.String) definition code for org.w3c.dom.Node.isSupported(java.lang.String, java.lang.String) , lookupNamespaceURI sample code for org.w3c.dom.Node.lookupNamespaceURI(java.lang.String) definition code for org.w3c.dom.Node.lookupNamespaceURI(java.lang.String) , lookupPrefix sample code for org.w3c.dom.Node.lookupPrefix(java.lang.String) definition code for org.w3c.dom.Node.lookupPrefix(java.lang.String) , normalize sample code for org.w3c.dom.Node.normalize() definition code for org.w3c.dom.Node.normalize() , removeChild sample code for org.w3c.dom.Node.removeChild(org.w3c.dom.Node) definition code for org.w3c.dom.Node.removeChild(org.w3c.dom.Node) , replaceChild sample code for org.w3c.dom.Node.replaceChild(org.w3c.dom.Node, org.w3c.dom.Node) definition code for org.w3c.dom.Node.replaceChild(org.w3c.dom.Node, org.w3c.dom.Node) , setNodeValue sample code for org.w3c.dom.Node.setNodeValue(java.lang.String) definition code for org.w3c.dom.Node.setNodeValue(java.lang.String) , setPrefix sample code for org.w3c.dom.Node.setPrefix(java.lang.String) definition code for org.w3c.dom.Node.setPrefix(java.lang.String) , setTextContent sample code for org.w3c.dom.Node.setTextContent(java.lang.String) definition code for org.w3c.dom.Node.setTextContent(java.lang.String) , setUserData sample code for org.w3c.dom.Node.setUserData(java.lang.String, java.lang.Object, org.w3c.dom.UserDataHandler) definition code for org.w3c.dom.Node.setUserData(java.lang.String, java.lang.Object, org.w3c.dom.UserDataHandler)
 

Method Detail

getName sample code for org.w3c.dom.Attr.getName() definition code for org.w3c.dom.Attr.getName()

String sample code for java.lang.String definition code for java.lang.String  getName()
Returns the name of this attribute. If Node.localName is different from null, this attribute is a qualified name.


getSpecified sample code for org.w3c.dom.Attr.getSpecified() definition code for org.w3c.dom.Attr.getSpecified()

boolean getSpecified()
True if this attribute was explicitly given a value in the instance document, false otherwise. If the application changed the value of this attribute node (even if it ends up having the same value as the default value) then it is set to true. The implementation may handle attributes with default values from other schemas similarly but applications should use Document.normalizeDocument() to guarantee this information is up-to-date.


getValue sample code for org.w3c.dom.Attr.getValue() definition code for org.w3c.dom.Attr.getValue()

String sample code for java.lang.String definition code for java.lang.String  getValue()
On retrieval, the value of the attribute is returned as a string. Character and general entity references are replaced with their values. See also the method getAttribute on the Element interface.
On setting, this creates a Text node with the unparsed contents of the string, i.e. any characters that an XML processor would recognize as markup are instead treated as literal text. See also the method Element.setAttribute().
Some specialized implementations, such as some [SVG 1.1] implementations, may do normalization automatically, even after mutation; in such case, the value on retrieval may differ from the value on setting.


setValue sample code for org.w3c.dom.Attr.setValue(java.lang.String) definition code for org.w3c.dom.Attr.setValue(java.lang.String)

void setValue(String sample code for java.lang.String definition code for java.lang.String  value)
              throws DOMException sample code for org.w3c.dom.DOMException definition code for org.w3c.dom.DOMException 
On retrieval, the value of the attribute is returned as a string. Character and general entity references are replaced with their values. See also the method getAttribute on the Element interface.
On setting, this creates a Text node with the unparsed contents of the string, i.e. any characters that an XML processor would recognize as markup are instead treated as literal text. See also the method Element.setAttribute().
Some specialized implementations, such as some [SVG 1.1] implementations, may do normalization automatically, even after mutation; in such case, the value on retrieval may differ from the value on setting.

Throws:
DOMException sample code for org.w3c.dom.DOMException definition code for org.w3c.dom.DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.

getOwnerElement sample code for org.w3c.dom.Attr.getOwnerElement() definition code for org.w3c.dom.Attr.getOwnerElement()

Element sample code for org.w3c.dom.Element definition code for org.w3c.dom.Element  getOwnerElement()
The Element node this attribute is attached to or null if this attribute is not in use.

Since:
DOM Level 2

getSchemaTypeInfo sample code for org.w3c.dom.Attr.getSchemaTypeInfo() definition code for org.w3c.dom.Attr.getSchemaTypeInfo()

TypeInfo sample code for org.w3c.dom.TypeInfo definition code for org.w3c.dom.TypeInfo  getSchemaTypeInfo()
The type information associated with this attribute. While the type information contained in this attribute is guarantee to be correct after loading the document or invoking Document.normalizeDocument(), schemaTypeInfo may not be reliable if the node was moved.

Since:
DOM Level 3

isId sample code for org.w3c.dom.Attr.isId() definition code for org.w3c.dom.Attr.isId()

boolean isId()
Returns whether this attribute is known to be of type ID (i.e. to contain an identifier for its owner element) or not. When it is and its value is unique, the ownerElement of this attribute can be retrieved using the method Document.getElementById . The implementation could use several ways to determine if an attribute node is known to contain an identifier:
If validation occurred while invoking Document.normalizeDocument(), all user-determined ID attributes are reset and all attribute nodes ID information are then reevaluated in accordance to the schema used. As a consequence, if the Attr.schemaTypeInfo attribute contains an ID type, isId will always return true.

Since:
DOM Level 3