Returns the ids of the RebarInSystem elements owned by the AreaReinforcement element. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
Remarks
 The RebarInSystem elements are only created if ReinforcementSettings.HostStructuralRebar is set to true. If that setting is false, this function returns an empty array.