#coordinate_system__frame_of_reference__reference_system__referencesystem__reference_frame__referenceframe  a system that uses coordinates to establish position
  supertype:  organisation__arrangement__organization__system  an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"
  part:  coordinate_axis
  subtype:  inertial_reference_frame__inertial_frame  a coordinate system in which Newton's first law of motion is valid
  subtype:  space-time_continuum__space-time__spacetime  the 4-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are located

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