[postgis-devel] Motion: vote for considering SRID <= 0 as "unknown"

Sandro Santilli strk at keybit.net
Tue Oct 4 10:36:19 PDT 2011

So, to recap, SQL/MM says:

  A spatial reference system identifier that is equal to 0 (zero) is

  A spatial reference system identifier that is not equal to 0 (zero) is

As per Paul's definition link [1] threatment of both is left to
the implementation to decide upon, but while SRID=0 is _required_
to be defined and documented, SRID<>0 is not even forced, but just
encouraged to be defined (??)

[1] http://www.lispworks.com/documentation/HyperSpec/Body/26_glo_i.htm

Going back to the motion of this thread, nothing makes me feel like we
should consider SRID <= 0 as references to rows of spatial_ref_sys.


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