Add an attribute to the end of the list.
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 qName The qualified (prefixed) name, or the empty stringif qualified names are not available.
@param type The attribute type as a string.
@param value The attribute value.