The service point is the unit of service
Status: proposed
Most NWSS observations are about one service point: the place that receives the service, whether a household’s plot, a business, a school or a communal point. A service point is a kind of site. It is registered once, at enumeration, and identified by a urn:uuid: IRI. In the field it is found by its tag, typically a QR code fixed at the service point, which resolves to that IRI (ADR-0003). A painted or assigned number may serve as a label people can read. The tag, the label and any land-parcel reference are never its identity, and records refer to the service point by IRI.
Households and people at a service point are counted in the graph and in all reporting, never identified there. Who lives at or answers for a service point (occupant, owner, responsible party) is an agent’s relationship to it. The project’s people register holds who they are and how to reach them, so that field teams can contact the owner or manager, by telephone if need be. That register is operational: it is never published and never enters the ledger (ADR-0004).
Service zones group service points. A zone’s identity never changes: a boundary fix is a new version, and a split or merge creates new zones that point to their predecessors. A service point’s zone is assigned explicitly. Geometry only flags an assignment that disagrees with the polygon.
Distilled from novaWaste2 ADR-0014, ADR-0022, ADR-0024 and ADR-0026 (docs/distillation/entities.md §1.1).