[postgis-devel] multisurface definition in bnf-wkt.txt

[Paul Ramsey]

Yes, these are types picked up from drafts. polyhedral surface did
make SFSQL 1.2. haven't seen tin/triangle in anything (which makes me
less happy that we have them, since they seem to get little enough
use, and I'm not really convinced they are good ways to model that
stuff, but water under the bridge...)

P

On Fri, Jan 10, 2014 at 5:02 AM, Mateusz Łoskot <mateusz at loskot.net> wrote:
> Hi,
>
> The bnf-wkt.txt [1], with last commit saying "Document ISO WKT/WKB (#1451)"
> specifies:
>
> <multisurface text representation> ::=
>     MULTISURFACE [ <z m> ] <multisurface text> |
>     <multipolygon text representation> |
>     <polyhedralsurface text representation> |
>     <tin text representation>
>
> whereas the ISO/IEC 13249-3 (Date: 2009-01-16) specifies:
>
> <multisurface text representation> ::=
>      MULTISURFACE [ <z m> ] <multisurface text>
>    | <multipolygon text representation>
>
> <multisurface text> ::=
>      <empty set>
>    | <left paren> <surface text>
>       { <comma> <surface text> }... <right paren>
>
> <surface text> ::=
>      CURVEPOLYGON <curvepolygon text body>
>    | <polygon text body>
>
>
> Why bnf-wkt.txt adds polyhedralsurface and tin to
> multisurface text representation?
> Is that PostGIS-specific behaviour?
>
> [1] https://github.com/postgis/postgis/blob/svn-trunk/doc/bnf-wkt.txt
>
> Best regards,
> --
> Mateusz  Łoskot, http://mateusz.loskot.net
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