Compare

The same canonical meaning, shown beside each native standard. Semantic loss stays in the cell.

Mapping grades
A	Lossless / structurally close	The native structure can carry the canonical meaning without a recorded loss.
B	Semantically equivalent	The meaning matches. The structure may differ.
C	Composite	The canonical concept is assembled from more than one native field.
D	Partial	Only part of the meaning is preserved. The mapping states the loss.
E	Unsupported	The native standard has no field for this meaning.

REQUIRES SOURCE. No canonical types are in this snapshot, so there are no comparison rows. Grades above are the scale that will be used. Loss is never omitted once a mapping exists.