An enumerated type listing special types that can appear in an  ExportLayerTable  . These types do not represent an independent category in Revit, but can be mapped to specific layers on export. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
  Since:  2014 
Syntax
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Members
| Member name | Description | 
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| Default | The default value for most Revit categories and subcategories. | 
| InteriorWall | The special type representing interior walls. | 
| ExteriorWall | The special type representing exterior walls. | 
| FoundationWall | The special type representing foundation walls. | 
| RetainingWall | The special type representing retaining walls. |