- From: Svensson, Lars <L.Svensson@dnb.de>
- Date: Fri, 19 Jun 2015 15:45:02 +0000
- To: Andrea Perego <andrea.perego@jrc.ec.europa.eu>, Frans Knibbe <frans.knibbe@geodan.nl>
- Cc: "Mcgibbney, Lewis J (398M)" <Lewis.J.Mcgibbney@jpl.nasa.gov>, "SDW WG Public List" <public-sdw-wg@w3.org>
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 15:45:36 UTC