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Model-Based Definition (MBD) is a model with PMI (Product Manufacturing Information) and consisting of:

1. the 3D geometry (serves as the basic dimensions)

2. the annotations (displayed notes, dimensions and tolerances or GD&T)

3. the attributes (metadata, key characteristics, and queried data)

4. the presentation states (saved views, presentation organization)

See Also:
Model-Based Definition, Geometry, Annotation, Attribute, Presentation State, PMI