| Scoring | string (scoring-method) | The scoring method applied by this calculation. Mirrors FHIR R5 Measure.scoring: proportion, ratio, continuous-variable, cohort. Authors validate the populations against this value at schema-load time.
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| Subject class | uri | The PublicSchema class URI whose records the populations select over (for example, publicschema:Person or publicschema:Enrollment). Diverges from FHIR Measure.subject[x], which is CodeableConcept | Reference(Group); PublicSchema subjects are PS class URIs.
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| Populations | concept:metrics/PopulationCriterion | The ordered list of PopulationCriterion records that select records for the numerator, denominator, exclusions, exceptions, and the per-record observation in a continuous-variable scoring method. |
| Stratifiers | concept:metrics/Stratifier | The list of Stratifier expressions evaluated against the populations of this calculation. |
| Rate aggregation | string (rate-aggregation) | How per-stratum rates are aggregated back to a single metric value: average, sum, or none (report per-stratum only).
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| Improvement notation | string (improvement-notation) | Whether an increase in the metric value is desirable, undesirable, or policy-dependent. Extends FHIR R5 Measure.improvementNotation with policy_dependent for non-clinical metrics (e.g., expenditure-to-GDP ratios where the desirable direction depends on policy framing).
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| Libraries | uri | HTTPS-dereferenceable library URIs hosting reusable criteria definitions referenced by @ref:LibraryName.Symbol expressions in the calculation. PublicSchema recommends content-addressed URIs so a metric's calculation is bit-stable across publications.
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