null values in GML

[Mateusz Loskot]

Bart van den Eijnden (OSGIS) wrote:
> Hi list,
> 
> I have a strange phenomenon.
> 
> A shape attribute table has some null values in it (column type
> Real), for instance:
> 
> OGRFeature(nap_speciaal):856 pnt_pntid (String) = 000A2510 .. 
> hgt_hgtwd (Real) = (null) .. POINT (122880 487860)
> 
> Using Mapserver WFS I get the following GML output:
> 
> <ms:pnt_pntid>000A2510</ms:pnt_pntid> .. 
> <ms:hgt_hgtwd>************************</ms:hgt_hgtwd> ..
> 
> Does anybody have an idea what is causing the sequence of asterisks?

Asterix is used to indicate NULL value in Shapefile attribute.
I'm completely not sure, but I suppose MS WFS driver does not handle
asterix as null but accepts it as a string value and puts into output GML.

Cheers
-- 
Mateusz Loskot
http://mateusz.loskot.net