schema: add DENM JSON schema v2.3.0

[raphael-ram]

Description

Adds the DENM (Decentralized Environmental Notification Message) JSON Schema v2.3.0 at schema/denm/denm_schema_2-3-0.json.

This version extends the alacarte optional container to follow the ETSI spec structure, introducing a proper stationary_vehicle_container with all fields defined in StationaryVehicleContainer.

Changes

• Add schema/denm/denm_schema_2-3-0.json — full JSON Schema for DENM messages (v2.3.0)
• Extend alacarte container with:
  • lane_position — transversal position on the carriageway
  • stationary_vehicle_container — nested container following StationaryVehicleContainer (ETSI EN 302 637-3), with:
    • stationary_since — duration the vehicle has been stationary
    • stationary_cause — main and sub cause code
    • carrying_dangerous_goods — dangerous goods type and UN number
    • number_of_occupants — number of occupants in the vehicle
    • vehicle_identification — WMI code and VDS
    • energy_storage_type — energy storage bitmask

All fields are optional, consistent with the ETSI ASN.1 definition.

[mathieu1fb]

After reviewing DENM spec, I would prefer that we follow the same structure : the AlacarteContainer can optionally contain aStationaryVehicleContainer which has more fields than currently present in your update.

AlacarteContainer ::= SEQUENCE {
    lanePosition        LanePosition OPTIONAL,
    impactReduction     ImpactReductionContainer OPTIONAL,
    externalTemperature Temperature OPTIONAL,
    roadWorks           RoadWorksContainerExtended OPTIONAL,
    positioningSolution PositioningSolutionType OPTIONAL,
    stationaryVehicle   StationaryVehicleContainer OPTIONAL,
    ...,
[[  roadConfiguration 	RoadConfigurationContainer OPTIONAL,
    preCrash            PreCrashContainer OPTIONAL ]]
}

StationaryVehicleContainer ::= SEQUENCE {
    stationarySince        StationarySince OPTIONAL, 
    stationaryCause        CauseCodeV2 OPTIONAL,
    carryingDangerousGoods DangerousGoodsExtended OPTIONAL,
    numberOfOccupants      NumberOfOccupants OPTIONAL,
    vehicleIdentification  VehicleIdentification OPTIONAL,
    energyStorageType      EnergyStorageType OPTIONAL
}

We do not need to specify everything present in the AlacarteContainer for now as all fields are optional, maybe the LanePosition, StationaryVehicleContainer and RoadWorksContainerExtended would be enough.

RoadWorksContainerExtended ::= SEQUENCE {
    lightBarSirenInUse      LightBarSirenInUse OPTIONAL,
    closedLanes             ClosedLanes OPTIONAL,
    restriction             RestrictedTypes OPTIONAL,
    speedLimit              SpeedLimit OPTIONAL,
    incidentIndication      CauseCodeV2 OPTIONAL,
    recommendedPath         ItineraryPath OPTIONAL,
    startingPointSpeedLimit DeltaReferencePosition OPTIONAL,
    trafficFlowRule         TrafficRule OPTIONAL,
    referenceDenms          ActionIdList OPTIONAL
}

[mathieu1fb]

Thanks for the update, approved!