- From: Clemens Portele <portele@interactive-instruments.de>
- Date: Fri, 19 Jun 2015 18:01:40 +0200
- To: "Svensson, Lars" <L.Svensson@dnb.de>
- Cc: Andrea Perego <andrea.perego@jrc.ec.europa.eu>, "Frans. Knibbe@Geodan. Nl" <frans.knibbe@geodan.nl>, "Mcgibbney, Lewis J (398M)" <Lewis.J.Mcgibbney@jpl.nasa.gov>, SDW WG Public List <public-sdw-wg@w3.org>
Lars,
the new WKT for CRS (ISO 19162 or http://docs.opengeospatial.org/is/12-063r5/12-063r5.html) is a lot clearer on this than the Geometry WKT specs were. I expect that future revisions of the Geometry WKT will follow the same rules, too.
Case sensitivity: http://docs.opengeospatial.org/is/12-063r5/12-063r5.html#18
Whitespace in WKT: http://docs.opengeospatial.org/is/12-063r5/12-063r5.html#138
Whitespace in the BNF: http://docs.opengeospatial.org/is/12-063r5/12-063r5.html#7
Clemens
> On 19 Jun 2015, at 17:45, Svensson, Lars <L.Svensson@dnb.de> wrote:
>
> Andrea,
>
> Sorry, but I can't resist a comment on WKT:
>
>> - it is case and "space" insensitive - i.e., all the following
>> variants are valid: " point(0 0)" "PoinT ( 0 0)", " POINT(0 0 ) "
>
> The specification of WKT in SFA [1] says _in the text_ that " Well known text is case insensitive." (ยง 7.2.1). The BNF does not reflect this though. E. g. for "point" it states
>
> <point tagged text> ::= point <point text>
>
> Further, the specification say nothing at all about whitespace when defining a point:
>
> <point text> ::= <empty set> | <left paren> <point> <right paren>
> <point> ::= <x> <y>
> <x> ::= <signed numeric literal>
> <y> ::= <signed numeric literal>
> <signed numeric literal> ::= {<sign>}<unsigned numeric literal>
> <unsigned numeric literal> ::= <exact numeric literal>
> |<approximate numeric literal>
> <exact numeric literal> ::= <unsigned integer>
> {<decimal point>{<unsigned integer>}}
> |<decimal point><unsigned integer>
> <approximate numeric literal> ::= <mantissa>E<exponent>
> <mantissa> ::= <exact numeric literal>
> <exponent> ::= <signed integer>
> <signed integer> ::= {<sign>}<unsigned integer>
> <unsigned integer> ::= (<digit>)*
>
> I stumbled over this when I tried to use the BNF to create a validator for WKT...
>
> [1] http://portal.opengeospatial.org/files/?artifact_id=25355
>
> Best,
>
> Lars
Received on Friday, 19 June 2015 16:02:14 UTC