The unique identifier for the opening.
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 id for the
parent surface, the prefix "op" and a sequential number, all
separated by "-". A sample value would be "su-1-op-1".