Returns all dimension elements that are currently labeled by this global parameter. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
  Since:  2016 Subscription Update 
Syntax
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Return Value
Collection of Element Ids.Remarks
 In case of a reporting parameter the returned collection will contain at most one element - the driving dimension, if it has been set already. It is because reporting parameters may have only one dimension labeled. For non-reporting parameters the set would contain all dimensions that have been labeled by this global parameter.