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The Attr
interface represents an attribute in an Element
object.
Typically the allowable values for the attribute are defined in a document
type definition.
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 nodeValue
attribute on the Attr
instance can also be used to
retrieve the string version of the attribute's value(s).
In XML, where the value of an attribute can contain entity references,
the child nodes of the Attr
node provide a representation in
which entity references are not expanded. These child nodes may be either
Text
or EntityReference
nodes. Because the
attribute type may be unknown, there are no tokenized attribute values.
Property Summary | ||
name |
getName | Returns the name of this attribute. |
specified |
getSpecified | If this attribute was explicitly given a value in the original
document, this is In summary:
|
value |
getValue setValue | On retrieval, the value of the attribute is returned as a string. Character and general entity references are replaced with their values. On setting, this creates a |
Fields inherited from interface org.w3c.dom.Node |
ATTRIBUTE_NODE,
CDATA_SECTION_NODE,
COMMENT_NODE,
DOCUMENT_FRAGMENT_NODE,
DOCUMENT_NODE,
DOCUMENT_TYPE_NODE,
ELEMENT_NODE,
ENTITY_NODE,
ENTITY_REFERENCE_NODE,
NOTATION_NODE,
PROCESSING_INSTRUCTION_NODE,
TEXT_NODE |
Method Summary | |
java.lang.String |
getName()
Returns the value of the name property. |
boolean |
getSpecified()
Returns the value of the specified property. |
java.lang.String |
getValue()
Returns the value of the value property. |
void |
setValue(java.lang.String value)
Assigns the value of the value property. |
Methods inherited from interface org.w3c.dom.Node |
appendChild,
cloneNode,
getAttributes,
getChildNodes,
getFirstChild,
getLastChild,
getNextSibling,
getNodeName,
getNodeType,
getNodeValue,
getOwnerDocument,
getParentNode,
getPreviousSibling,
hasChildNodes,
insertBefore,
removeChild,
replaceChild,
setNodeValue |
Method Detail |
public java.lang.String getName()
name
property.public boolean getSpecified()
specified
property.public void setValue(java.lang.String value)
value
property.public java.lang.String getValue()
value
property.
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