In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Attributes), special FME feature attributes direct the SDF3 writer as it adds features to its output files, and are used by the SDF3 reader to store the characteristics of the features it reads.
The most important of these is the fdo_type attribute, which controls the overall interpretation of the feature. The correct values for fdo_type are
- fdo_point
- fdo_multipoint
- fdo_curve
- fdo_line
- fdo_arc
- fdo_multicurve
- fdo_multiline
- fdo_curvepolygon
- fdo_polygon
- fdo_ellipse
- fdo_multicurvepolygon
- fdo_multipolygon
- fdo_null
The parameters specified for each of these values are described in the following topics: