{
    "$schema": "http://json-schema.org/schema#",
    "$schemaVersion": "0.0.1",
    "$id": "https://smart-data-models.github.io/dataModel.ERA/Certificate/schema.json",
    "modelTags": "ERA vocabulary, railway, train",
    "license": "https://smart-data-models.github.io/dataModel.ERA/Certificate/LICENSE.md",
    "derivedFrom": "http://data.europa.eu/949/Signal",
    "type": "object",
    "allOf": [
        {
            "$ref": "https://smart-data-models.github.io/data-models/common-schema.json#/definitions/GSMA-Commons"
        },
        {
            "$ref": "https://smart-data-models.github.io/data-models/common-schema.json#/definitions/Location-Commons"
        },
        {
            "properties": {
                "type": {
                    "type": "string",
                    "enum": [
                        "Signal"
                    ],
                    "description": "Property. NGSI data type. It has to be Signal"
                },
                "relativeDistanceDangerPoint": {
                    "type": "integer",
                    "description": "Property. Relative distance of the danger point"
                },
                "signalId": {
                    "type": "string",
                    "description": "Property. Name of signal"
                },
                "signalOrientation": {
                    "type": "string",
                    "format": "uri",
                    "description": "Relationship. Signal orientation"
                },
                "signalType": {
                    "type": "string",
                    "format": "uri",
                    "description": "Relationship. Type of signal"
                },
                "track": {
                    "type": "string",
                    "format": "uri",
                    "description": "Relationship. Track"
                }
            }
        }
    ],
    "required": [
        "id",
        "type"
    ],
    "title": "Signal + mapped from ERA ontology by Smart Data Models",
    "description": "A railway signal is an installation next to the railway track for signalling the maximum allowed speed in the next block section to the train driver.\nDefinition RSM: Apparatus by means of which a conventional visual or acoustic indication is given, generally concerning the movements of railway vehicles."
}