def to_xml(parser)
      n = parser.new_node('data')
      n = parser.append_node(n, parser.new_text(encoded_value()))
      n
    end
def to_xml(parser)
      n = parser.new_node('data')
      n = parser.append_node(n, parser.new_text(encoded_value()))
      n
    end
convert to XML