var addRepDesc = {
  $help: ['Short (packed) representation description as a set of variables', '    s=<EXPRESSION>', '        selector property', '    m=<MODE_ID>[!<PARAMETER>:<VALUE>[,...]]', '        render mode property', '    c=<COLORER_ID>[!<PARAMETER>:<VALUE>[,...]]', '        color mode property', '    mt=<MATERIAL_ID>', '        material property'],
  s: {
    $help: 'Selection expression string as it is in menu->representations->selection'
  },