-typedef std::string VRKey;
-typedef std::string VRAtr;
-typedef std::map<VRKey, VRAtr> VRHT; // Value Representation Hash Table
+typedef std::string gdcmVRKey;
+typedef std::string gdcmVRAtr;
+/// Value Representation Hash Table
+typedef std::map<gdcmVRKey, gdcmVRAtr> gdcmVRHT;