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Occasionally if you're using a spatial engine that does not support specific geometry types, point, line and polygon, but instead just a generic geometry type (this includes SQL Server) then you may need to tell the selection map engine what type of renderer to use for a particular entity. This is particularly important if you're seeing "Unable to make suitable draw style for ..." messages in the weave.log file (note that another page that may be relevant in this situation, and is probably a better solution is this page if you're using SQL Server)
This can be done by setting the geometry type for an entity as follows:
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