[fdo-internals] ArcSDE provider + raster data

[Jackie Ng]

You're actually doing something that to my knowledge has not actually being
achieved before in an FDO provider: A provider that supports *both* raster
and vector data.

Having said that, and having no knowledge of ArcSDE itself, a conceptual
overview of the work required would probably be as follows:

 * Extend the provider's FdoIDescribeSchema to include raster feature
classes in the FDO logical schema
 * Extend the provider's FdoISelect to handle queries involving raster FDO
properties
 * Implement the FdoIRaster interface
 * Implement ArcSDE's FdoIReader::GetRaster that returns your FdoIRaster
implementation

Even though the WMS FDO provider was out of your consideration, that
provider and the GDAL provider are the only raster-based FDO providers
around and may serve as a useful reference point in implementation.

Please note that very few of us here have paid the ESRI admission fee so
community advice, testing and feedback on your ArcSDE provider enhancement
work (if any) will be somewhat limited.

- Jackie



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