DOMAttr represents an attribute in the DOMElement object.
The name of the attribute
The element which contains the attribute
Not implemented yet, always is NULL
Not implemented yet, always is NULL
The value of the attribute
See also the properties from the inherited class DOMNode ( http://php.net/manual/en/class.domnode.php ), eg. namespaceURI, prefix, localName, etc, especially if you have to deal with namespaced attributes