text: #
  # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  
  from collections import namedtuple
  
  Tag = namedtuple('Tag', 'key val overridable')
  Tag.__new__.__defaults__ = (None, None, False)
  
  HttpUrl = 'url'
  HttpMethod = 'http.method'
  HttpStatus = 'status.code'
  DbType = 'db.type'
  DbInstance = 'db.instance'
  DbStatement = 'db.statement'
  DbSqlParameters = 'db.sql.parameters'
  HttpParams = 'http.params'
  MqBroker = 'mq.broker'
  MqTopic = 'mq.topic'
  MqQueue = 'mq.queue'
  