text: ////////////////////////////////////////////////////////////////////////////////
  /// DISCLAIMER
  ///
  /// Copyright 2018 ArangoDB GmbH, Cologne, Germany
  ///
  /// Licensed 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.
  ///
  /// Copyright holder is ArangoDB GmbH, Cologne, Germany
  ///
  /// @author Andrey Abramov
  /// @author Vasiliy Nabatchikov
  ////////////////////////////////////////////////////////////////////////////////
  
  #ifndef ARANGOD_IRESEARCH__IRESEARCH_COMMON_H
  #define ARANGOD_IRESEARCH__IRESEARCH_COMMON_H 1
  
  #include "Logger/LogTopic.h"
  #include "VocBase/LogicalDataSource.h"
  
  namespace arangodb {
  namespace iresearch {
  
  arangodb::LogicalDataSource::Type const& dataSourceType();
  arangodb::LogTopic& logTopic();
  
  ADB_IGNORE_UNUSED static auto& DATA_SOURCE_TYPE = dataSourceType();
  ADB_IGNORE_UNUSED static auto& TOPIC = logTopic();
  
  ////////////////////////////////////////////////////////////////////////////////
  /// @brief the current implementation version of the iresearch interface
  ///        e.g. which how data is stored in iresearch
  ////////////////////////////////////////////////////////////////////////////////
  size_t const LATEST_VERSION = 0;
  
  struct StaticStrings {
    ////////////////////////////////////////////////////////////////////////////////
    /// @brief the name of the field in the IResearch View definition denoting the
    ///        corresponding link definitions
    ////////////////////////////////////////////////////////////////////////////////
    static std::string const LinksField;
  
    ////////////////////////////////////////////////////////////////////////////////
    /// @brief the name of the field in the IResearch View definition denoting the
    ///        corresponding link definitions
    ////////////////////////////////////////////////////////////////////////////////
    static std::string const VersionField;
  
    ////////////////////////////////////////////////////////////////////////////////
    /// @brief the id of the field in the IResearch Link definition denoting the
    ///        corresponding IResearch View
    ////////////////////////////////////////////////////////////////////////////////
    static std::string const ViewIdField;
  };
  
  } // iresearch
  } // arangodb
  
  #endif