List of geometry type codes that can specified in an ogr gfs file.

ogr_gfs_geom_types.md

OGR GFS Geometry Values

The geometry type of a feature class can be specified in a .gfs file used by OGR to map from a GML document to a simple feature schema. The following numbers can be used to specify a specific geometry type:

-2147483647 Point25D
-2147483646 LineString25D
-2147483645 Polygon25D
-2147483644 MultiPoint25D
-2147483643 MultiLineString25D
-2147483642 MultiPolygon25D
          0 Geometry
          1 Point
          2 Line
          3 Polygon
          4 MultiPoint
          5 MultiLineString
          6 MultiPolygon
        100 No Geometry

---

<GMLFeatureClass>
    <Name>Address</Name>
    <ElementPath>Address</ElementPath>
    <GeometryType>1</GeometryType>
    <SRSName>EPSG:27700</SRSName>
    ...
</GMLFeatureClass>

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For a complete list see the OGR source.