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- =head1 NAME
-
- XML::DOM::Attr - An XML attribute in XML::DOM
-
- =head1 DESCRIPTION
-
- XML::DOM::Attr extends L<XML::DOM::Node>.
-
- The Attr nodes built by the XML::DOM::Parser always have one child node
- which is a Text node containing the expanded string value (i.e. EntityReferences
- are always expanded.) EntityReferences may be added when modifying or creating
- a new Document.
-
- 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 undef 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.
-
- =head2 METHODS
-
- =over 4
-
- =item getValue
-
- On retrieval, the value of the attribute is returned as a string.
- Character and general entity references are replaced with their values.
-
- =item setValue (str)
-
- DOM Spec: On setting, this creates a Text node with the unparsed contents of the
- string.
-
- =item getName
-
- Returns the name of this attribute.
-
- =back
-