The SDF writer outputs each feature type into a separate file in order to comply with Autodesk MapGuide. Each feature has the following associations: vertices, a name, an ID, and a Universal Resource Locator (URL). The SDF Writer will output .sdf files along with their paired .sif file.
Note: The Autodesk MapGuide Component Toolkit (SDFComTk) limits the number of vertices that can be stored in each feature when writing. If the toolkit version is less than 6.0, the maximum number of vertices that can be written to a feature is 16384. If you have version 6.0 or newer, the limit is 65535 vertices.