is#graph_visualization_interface__graphvisualizationinterface
  supertype:  #graphical_user_interface__GUI  a user interface based on graphics (icons and pictures and menus) instead of text; uses a mouse as well as a keyboard as an input device
  subtype:  is#display-only_graph_viewer
  subtype:  is#graph_editor__grapheditor__graph_graphical-editor__graphgraphicaleditor
     subtype:  is#hierarchy_editor__hierarchyeditor  a graph editor tailored to ease the display and edition of hierarchies
        subtype:  km#taxonomy_graphical_editor
     subtype:  is#hyperbolic_graph_editor
     subtype:  km#knowledge_graphical_editor__knowledgegraphicaleditor
        subtype:  km#taxonomy_graphical_editor
        subtype:  km#CG_graphical_editor
           subtype:  km#Charger
        subtype:  km#FCA_structure_graphical_editor  graphic editor of FCA objects

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