Identifies if elements of the category are able to report what materials they contain in what quantities. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
Remarks
 Get materials via the Element' property Materials; Get quantities via methods GetMaterialArea and GetMaterialVolume.