# Gelios provider package v5

Version 5 preserves the Ontology-exact monitoring logic from provider package
v4 and publishes it through the immutable `fleet.positions.current.v4@4.0.0`
contract.

The Data Product now declares a machine-enforced contract for every published
field. In particular:

- `signal_state` is required and accepts only `active` or `inactive`;
- `movement_state` is required and accepts only `moving` or `stopped`;
- identity/presentation attributes are typed and required where the mapping
  must always produce them;
- optional telemetry is type-checked and bounded where the physical domain has
  a stable lower or upper limit;
- geometry remains optional, but when present it must be a valid GeoJSON Point.

The provider mapping is checked against the same contract before it can be
packaged, and External Data Plane checks every publish at runtime. Existing
v1-v3 products remain immutable and backward compatible.