The source for these classes is in the FeatureSource-1_0_0.cs file, which is located in the <Map 3D SDK root folder>\Map Samples\Platform\Schema folder. The FeatureSource-1_0_0 .cs file is generated from the FeatureSource-1.0.0.xsd file using the .NET Framework SDK tool xsd.exe. The FeatureSource-1.0.0xsd file is located in the MapGuide Server Schema folder (<MapGuide Enterprise folder>\Server\Schema). The xsd.exe tool is located in the bin folder of the .NET Framework SDK (C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin\xsd.exe. The .NET Framework SDK installer places the SDK inside the Microsoft Visual Studio 8 installation. Documentation on the use of the xsd.exe tool can be found at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cptools/html/cpconxmlschemadefinitiontoolxsdexe.asp.
Help for these classes can be found in the Modules/XML Schemas topic in theGeospatial Platform .NET Reference (<Map 3D root folder>\Help\sdk.ref.gis.platform.chm).