"definitions": {
    "SchedLocAttributes": {
        "type": "object",
        "description": "Attributes common to all schedule locations",
        "required": ["tpl"],
        "properties": {
            "tpl": { "type": "string", "description": "TIPLOC" },
            "act": { "type": "string", "default": "  ", "description": "Current Activity Codes" },
            "planAct": { "type": "string", "description": "Planned Activity Codes" },
            "can": { "type": "boolean", "default": false, "description": "Cancelled flag" },
            "fid": { "type": "string", "description": "Unique identifier of the formation data (v3) " }
        }
    },
    "CallPtAttributes": {
        "type": "object",
        "description": "Attributes for Calling Points (Optional for Operational variants)",
        "properties": {
            "pta": { "type": "string", "description": "Public Scheduled Time of Arrival" },
            "ptd": { "type": "string", "description": "Public Scheduled Time of Departure" },
            "avgLoading": { "type": "string", "description": "Average Loading value based on long-term averages (v3) " }
        }
    },
    "originPoint": {
        "description": "Merged Origin (OR / OPOR). The starting point of the journey.",
        "required": ["wtd"],
        "allOf": [
            { "$ref": "#/definitions/SchedLocAttributes" },
            { "$ref": "#/definitions/CallPtAttributes" },
            {
                "type": "object",
                "properties": {
                    "wta": { "type": "string", "description": "Working Scheduled Time of Arrival (Optional)" },
                    "wtd": { "type": "string", "description": "Working Scheduled Time of Departure (Required)" },
                    "fd": { "type": "string", "description": "False Destination TIPLOC (Passenger only)" }
                }
            }
        ]
    },
    "callingPoint": {
        "description": "Merged Intermediate Point (IP / OPIP). An intermediate stop requiring dwell time.",
        "required": ["wta", "wtd"],
        "allOf": [
            { "$ref": "#/definitions/SchedLocAttributes" },
            { "$ref": "#/definitions/CallPtAttributes" },
            {
                "type": "object",
                "properties": {
                    "wta": { "type": "string", "description": "Working Scheduled Time of Arrival (Required)" },
                    "wtd": { "type": "string", "description": "Working Scheduled Time of Departure (Required)" },
                    "rdelay": { "type": "integer", "default": 0, "description": "Route delay value" },
                    "fd": { "type": "string", "description": "False Destination (Passenger only)" }
                }
            }
        ]
    },
    "passPoint": {
        "description": "Intermediate Passing Point (PP). Purely operational.",
        "required": ["wtp"],
        "allOf": [
            { "$ref": "#/definitions/SchedLocAttributes" },
            {
                "type": "object",
                "properties": {
                    "wtp": { "type": "string", "description": "Working Scheduled Time of Passing (Required)" },
                    "rdelay": { "type": "integer", "default": 0, "description": "Route delay value" }
                },
                "additionalProperties": false 
            }
        ]
    },
    "destinationPoint": {
        "description": "Merged Destination (DT / OPDT). The termination point of the journey.",
        "required": ["wta"],
        "allOf": [
            { "$ref": "#/definitions/SchedLocAttributes" },
            { "$ref": "#/definitions/CallPtAttributes" },
            {
                "type": "object",
                "properties": {
                    "wta": { "type": "string", "description": "Working Scheduled Time of Arrival (Required)" },
                    "wtd": { "type": "string", "description": "Working Scheduled Time of Departure (Optional)" },
                    "rdelay": { "type": "integer", "default": 0, "description": "Route delay value" }
                }
            }
        ]
    }
}