def rest_xml
      uea = rest_rexml
      doc = REXML::Document.new APIConnection::XML_HEADER
      doc << uea
      return doc.to_s
    end
def rest_xml
      uea = rest_rexml
      doc = REXML::Document.new APIConnection::XML_HEADER
      doc << uea
      return doc.to_s
    end
Return the REST XML for this item, with the current values,
 for saving or updating