NAME

       Attribute - a single attribute

API

   new ( key, value, prefix )
       Create a new attribute node.

   getName
       Returns the key for the attribute

   getLocalName
       As getName above, but without namespace information

   getNodeValue / getData
       Returns the value

   setNodeValue
       Sets the value of the attribute node.

   getPrefix
       Returns the prefix

   getNamespace
       Return the namespace.

   toString
       Generates key="value", encoded correctly.