Introduction
The Feature Data Objects (FDO) API provides access to data in a data store. A provider is a specific implementation of the FDO API that provides access to data in a particular data store. The FDO Provider for SDF provides FDO with access to an SDF-based data store.
The Autodesk SDF file format is a standalone, file-based spatial database format that supports multiple features classes and properties in a single file, and provides spatial indexing, interoperability, and high performance for large data sets.
The SDF file format has the following characteristics:
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SDF files can be read on different platforms.
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One schema in a single SDF file supports multiple feature classes.
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The SDF file has its own spatial indexing.
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SDF files can store geometric and non-geometric data with minimum overhead.
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The SDF file format supports a single writer at any time, with multiple readers.
An SDF schema can support the following:
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Auto ID generation
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Exclusive value range constraints
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Null value constraints
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Spatial contexts
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These geometry types: point, line string, polygon, multi-point, multi-line string, multi-polygon, curve string, curve polygon, multi-curve string, multi-curve polygon, linear ring, line string segment, circular arc segment, and ring.
For more information, see The Essential FDO and the FDO Developer's Guide.