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# Coverage, enrichment and clocks

Coverage uses the release's declared match census. An absent assessment remains
in the denominator. Unknown, missing, partial and not applicable are different
states; none should be converted to a false boolean or a numeric zero.

Read global coverage for a named release and per-match coverage before choosing
a family. Report discipline, season, family, grain and definition version with
each percentage. Do not add percentages or substitute historical inventory
percentages for a newly measured release.

## Enrichment semantics

| Family | Available meaning | Unsupported inference |
| --- | --- | --- |
| Rally | Source categories and explicitly reconstructed lengths | Bucket midpoint as observed exact length |
| Strokes | Classified outcome summaries by match/set/side/type/wing | Ordered shots, ball trajectories or tracking |
| Time evidence | Observed, relative or estimated clocks with role and anchor | Relative duration promoted to observed UTC |

Enrichment density uses accepted canonical points as its denominator, not a known
true complete-match length. Some releases do not project an enrichment family;
the capability metadata distinguishes that case from a projected but missing family.

## Time evidence

Preserve `kind`, `role`, `anchor`, `alignment`, `confidence` and `quality`.
An observed instant is not interchangeable with a received clock, estimated event
or relative elapsed duration. Relative zero is valid. Unknown anchors stay unknown.
Conflicting and nonmonotonic evidence remains visible rather than being silently
collapsed into a fabricated precise clock.

Do not derive actual match start by subtracting a duration from an end clock unless
an explicitly supported definition establishes that calculation. Unknown calendar
dates are independent from availability of point clocks.