A named collection of property sets. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Remarks
 This class can still read and write property set libraries, but the format it uses is not compatible with the native Revit adsklib property set library file format. It may be used for short term use to save and restore a user's own property sets, but this class may be removed in a future version of Revit.