Here is a list of all concepts with brief descriptions:

[detail level 123]

Nboat
Ngeometry
Rtagged
Rsrs_spec
Rbox
Rdynamic
Rlinestring
Rmulti
Rmulti_point
Rpoint
Rpolygon
Rsame_tag
Rsingle
Rcurve
Rprojection_or_transformation
Rogc99