An enumerated type listing all the relationship types between two sets of arbitrary nature. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Members
| Member name | Description | 
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| LeftEmpty | The left set is empty and the right set is not. | 
| RightEmpty | The right set is empty and the left set is not. | 
| BothEmpty | Both sets are empty. | 
| Disjoint | Both sets are not empty and don't overlap. | 
| Overlap | The overlap of two sets is not empty and strict subset of both. | 
| Subset | Both sets are not empty and the left set is strict subset of the right. | 
| Superset | Both sets are not empty and the left set is strict superset of the right. | 
| Equal | Two nonempty sets are equal. |