Just to inform you that now that the NAS driver is in GDAL trunk, I've been 
able to port its enhancements to the main GML driver. On the few samples I've 
tested, OS Mastermap GML files seem to be read correctly now.

See http://trac.osgeo.org/gdal/ticket/3680

Le Friday 02 July 2010 09:04:38 Martin Daly, vous avez écrit :
> >     Here it is not only GDAL/OGR that has a problem!  Currently, I know
> > of no importer that can handle this construct, other than the tool (from
> > Snowflake) used by OSGB to generate it - and there is also the question
> > of onwards storage.
>
> Not even close, I'm afraid.
>
> There are plenty of tools to read (all parts of) OS MM:
>
> http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/information/
>technical/software.html
>
> e.g. (an excellent one, at a very reasonable price...)
>
> http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/information/
>technical/software/cadcorp.html
>
> Also, as far as I am aware, OS GB use in-house software to generate the
> data.
>
> Martin
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