GDnTDatum

GDnTDatum captures datum features identified in the geometric dimensioning and tolerancing (GD&T) scheme of a drawing. The model records the datum label as it is written in the feature control frame — a single letter such as “A” or a composite name such as “(A-B-C-D)[CM]”. By exposing this structured view, the API allows you to reconstruct datum reference frames for tolerance analysis, inspection planning, or CAD alignment. Use it when you need to understand how the designer anchors measurements, controls part orientation, or defines assembly interfaces.

836
837
838
839
840
841
842
843
844
845
846
847

class GDnTDatum(BaseModel):
    """
    Represents a GD&T datum definition.
    """

    label: str = Field(
        ...,
        description=(
            "Reference name of the datum. Examples: 'A', 'B', or composite names "
            "such as '(A-B-C-D)[CM]'."
        ),
    )