[MS4W-Users] GML Invalid exterior ring

Moffatt, Greg Greg.Moffatt at amec.com
Thu Dec 6 08:45:09 EST 2012

Hi all,

I'm new to the list, but have already benefited greatly from the collective knowledge and experience here, so first: thank you.

I have a GML file that's generated by SQL Server that contains one or more polygons.  It used to work, but since I've upgraded the ms4w installation on my web server, any requests to MapServer for that layer fail with the message: msOGRFileNextShape(): OGR error. Invalid exterior ring.

An example of the GML is attached, along with a .map file.

I've worked my way back through the ms4w versions, and have found that a change between 3.0.3 and 3.0.4-beta1 may be the culprit:

ms4w 3.0.3 - Works
ms4w 3.0.4-beta1 - Invalid exterior ring
ms4w 3.0.5 - Invalid exterior ring
ms4w 3.0.6 - Invalid exterior ring

GDAL changed from 1.8.1RC2 to 1.9.0 in that step.  I've looked through the GDAL release notes, but nothing is jumping out at me.  Two questions:

1.       Do you know of any reason why the GML would fail to draw in recent versions?  Ideally, I'd like to correct my GML or MapServer configuration to get it to work in the latest ms4w version.

2.       If there's no solution in #1, would it be feasible to downgrade GDAL/OGR while keeping the remainder of ms4w intact (or would that be asking for trouble)?

A million thanks,

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