Add an attribute to the end of the list.
Do not pass in xmlns decls to this function!
For the sake of speed, this method does no checking to see if the attribute is already in the list: that is the responsibility of the application.
@param uri The Namespace URI, or the empty string ifnone is available or Namespace processing is not being performed.
@param localName The local name, or the empty string ifNamespace processing is not being performed.
@param rawName The raw XML 1.0 name, or the empty stringif raw names are not available.
@param type The attribute type as a string.
@param value The attribute value.
@throws TransformerException