Xdata needs to be available from element info\properties dialog.
Need similar tool to AutoCAD xdata.lsp in Microstation. Xdata is with known structure and could be possibly shown in element properties. - https://knowledge.autodesk.com/support/autocad/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/AutoCAD-Core/files/GUID-F0299B36-232F-446E-9F81-98F300B36991-htm.html

What is needed is a way how to keep attributes in DWG files so attributes are not lost in DGN/DWG workflow. For example attach Items in DWG workmode so they are saved as Xdata.

Enhancement 1078242