NAS - ALKIS
The NAS reader reads the NAS/ALKIS format used for cadastral data in Germany.
The format is a GML profile with fairly complex GML3 objects not easily read
with the general OGR GML driver.
This driver depends on GDAL/OGR being built with the Xerces XML parsing
This driver was implemented within the context of the PostNAS project
which has more information on it's use.