Relative to ArcObjects API and ArcGIS Server API

OSGeo FDO Provider for ArcSDE > ArcSDE Limitations >

Relative to ArcObjects API and ArcGIS Server API

The ArcSDE API does not support the following advanced functionality found in the ArcObjects API and the newer ArcGIS Server API:

Advanced geometries, such as Bezier curves and ellipses
Relationships
Topology
Networks
Analysis
Linear referencing

Curved Segments