package <http://mimathon.askem.eu/uc4/traffic>:
  dolfin_version "1"
  version "0.1.0"
  author "LESL (Lea, Eliott, Sattisvar & Louis), Dolfin & Askem"
  description "Canonical model for city-wide traffic observations, MIMathon Porto 2026 use case 04. Aggregated KPIs designed for dual-format output: Smart Data Models JSON-LD and DATEX II XML, from one authoritative pivot."

concept City:
  has name: one string
  has countryCode: one string
  has latitude: optional float
  has longitude: optional float

concept TrafficObservation:
  has localId: one string
  has city: one City
  has observedAt: one string
  has trafficIndex: optional float
  has trafficIndexWeekAgo: optional float
  has observedAtWeekAgo: optional string
  has jamsDelaySeconds: optional float
  has jamsLengthKm: optional float
  has jamsCount: optional int
  has travelTimePer10kmMin: optional float
  has historicTravelTimePer10kmMin: optional float
  has delayMin: optional float
  has source: optional string