Element reference types. 
   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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| REFERENCE_TYPE_NONE | The reference is to an element. | 
| REFERENCE_TYPE_LINEAR | The reference is to a curve or edge. | 
| REFERENCE_TYPE_SURFACE | The reference is to a face or face region. | 
| REFERENCE_TYPE_FOREIGN | The reference is to geometry or elements in linked Revit file. | 
| REFERENCE_TYPE_INSTANCE | The reference is an instance of a symbol. | 
| REFERENCE_TYPE_CUT_EDGE | The reference is to a face that was cut (where the original pick was made on the cut edge). | 
| REFERENCE_TYPE_MESH | The reference is to a mesh. |