[geos-devel] non precision related geometric issue

[strk at refractions.net]

On Tue, Jun 21, 2005 at 10:34:11AM +0200, strk at refractions.net wrote:
> On Mon, Jun 20, 2005 at 08:02:49PM -0400, Carl Anderson wrote:
> > 
> > Based on recent improvements in the geos library, I have started in 
> > depth geometric testing.
> > Thanks to all for the improvements.
> > 
> > attached is a test file for XMLTester for a failure case.
> > 
> > The B object has an edge intersection with itself, violating assertions 
> > 2.1.12.1 and 2.1.12.2 of the SF SQL spec.  GEOS reports it as valid but 
> > upon intersection it abends.  JTS/GEOS is not conditioned to test for 
> > those assertions but Martin may have had those assertions in mind when 
> > writing the overlayOp bts.
> 
> That's an error in XMLTester, swap A and B geometries and you'll
> read two 'false' from isvalid. 'arg1' is not honourated !
> I'll take a look at it.

I've fixed the isValid test handling and restructured the XMLTester
code somehow, but it's still often fails honouring parameters, don't 
expect it to always understand what you type in XML ...

--strk;