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You load .dgn, .dwg, .dxf CAD data, or .shp, etc. into your Bentley Map environment and noticed a new "Session" folder into your Command Manager dialog. This is what we call Dynamic Feature Scoring (DFS). By default Bentley Map applies Dynamic Feature Scoring rules and infers feature classes from non-XFM features (e.g. standard MicroStation elements).
This default behavior can be disabled in your .xml schema using the following > MS_GEOXFM_NO_DYNAMICSCOREDFEATURES=1
It can also be overridden with custom DFS rules if desired using the following > MS_GEOXFM_DYNAMICFEATURESCORING_FILES. Once defined, you need to properly create and edit the .xml file linked to this (not your schema, but a dedicated file where "rules" will be added).
Please, review "XFM Features > Working with Features in Bentley Map > What is the Dynamic Feature Scoring" from the Bentley Geospatial Administrator Help documentation related to this.