Removes all definitions from library. This is useful when importing several self-contained data sets within one session. Once a data set is imported, keeping the definitions specific to that data set will slow down the searches. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2015 
Syntax
| C# | 
|---|
   |  
| Visual Basic | 
|---|
   |  
| Visual C++ | 
|---|
   |