#connexion__connection__link  a connecting shape
  supertype:  shape__form  the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"
  subtype:  node.connexion  a connecting point at which several lines come together
  subtype:  join__articulation__joint__juncture__junction  the shape or manner in which things come together and a connection is made
     subtype:  esophagogastric_junction__esophagogastricjunction__oesophagogastric_junction  the junction between the esophagus and the stomach epithelium

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