MapGuide API Reference
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Returns the resource id of the Tile Set Definition that created this map, or the Tile Set Definition linked from the Map Definition used to created this map. If it was created from a Map Definition and that does not link to a Tile Set Definition, then NULL is returned.

Since:
3.0
Returns:
Returns the resource id of the Tile Set Definition. NULL if created from a Map Definition that does not link to a Tile Set