The unique identifier for the surface.
Namespace: Autodesk.Revit.DB.AnalysisAssembly: RevitAPI (in RevitAPI.dll) Version: 20.0.0.0 (20.0.0.377)
Since: 2012
Syntax
Remarks
This identification attribute is composed of the prefix "su"
and a sequential number, separated by "-". A sample value would
be "su-1".