{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "title": "LIF Layout Interchange Format",
    "type": "object",
    "properties": {
        "metaInformation": {
            "type": "object",
            "description": "Contains metadata about the project and the LIF file.",
            "properties": {
                "projectIdentification": {
                    "type": "string",
                    "description": "Human-readable name of the project (e.g., for display purposes)."
                },
                "creator": {
                    "type": "string",
                    "description": "Creator of the LIF file (e.g., name of company or person)."
                },
                "exportTimestamp": {
                    "type": "string",
                    "format": "date-time",
                    "description": "The timestamp at which this LIF file was created/updated/modified. Format is ISO8601 in UTC."
                },
                "lifVersion": {
                    "type": "string",
                    "description": "Version of the LIF file format. Follows semantic versioning (Major.Minor.Patch)."
                }
            },
            "required": [
                "projectIdentification",
                "creator",
                "exportTimestamp",
                "lifVersion"
            ]
        },
        "layouts": {
            "type": "array",
            "description": "Collection of layouts used in the facility by the driverless transport system. All layouts refer to the same global origin.",
            "items": {
                "type": "object",
                "properties": {
                    "layoutId": {
                        "type": "string",
                        "description": "Unique identifier for the layout."
                    },
                    "layoutName": {
                        "type": "string",
                        "description": "Name of the layout."
                    },
                    "layoutVersion": {
                        "type": "string",
                        "description": "Version number of the layout. It is suggested that this be an integer, represented as a string, incremented with each change, starting at 1."
                    },
                    "layoutLevelId": {
                        "type": "string",
                        "description": "Unique identifier for the layout level."
                    },
                    "layoutDescription": {
                        "type": "string",
                        "description": "Description of the layout. *Optional*."
                    },
                    "nodes": {
                        "type": "array",
                        "description": "List of nodes in the layout. Nodes are locations where vehicles can navigate to.",
                        "items": {
                            "type": "object",
                            "properties": {
                                "nodeId": {
                                    "type": "string",
                                    "description": "Unique identifier for the node."
                                },
                                "nodeName": {
                                    "type": "string",
                                    "description": "Name of the node. *Optional*."
                                },
                                "nodeDescription": {
                                    "type": "string",
                                    "description": "Description of the node. *Optional*."
                                },
                                "mapId": {
                                    "type": "string",
                                    "description": "Identifier for the map that this node belongs to. *Optional*."
                                },
                                "nodePosition": {
                                    "type": "object",
                                    "description": "Position of the node on the map (in meters).",
                                    "properties": {
                                        "x": {
                                            "type": "number",
                                            "description": "X coordinate of the node in meters. Range: [float64.min ... float64.max]"
                                        },
                                        "y": {
                                            "type": "number",
                                            "description": "Y coordinate of the node in meters. Range: [float64.min... float64.max]"
                                        }
                                    },
                                    "required": [
                                        "x",
                                        "y"
                                    ]
                                },
                                "vehicleTypeNodeProperties": {
                                    "type": "array",
                                    "description": "Vehicle-specific properties related to the node.",
                                    "items": {
                                        "type": "object",
                                        "properties": {
                                            "vehicleTypeId": {
                                                "type": "string",
                                                "description": "Identifier for the vehicle type."
                                            },
                                            "theta": {
                                                "type": "number",
                                                "description": "Absolute orientation of the vehicle on the node in reference to the global origin’s rotation. Range: [-Pi ... Pi]"
                                            },
                                            "actions": {
                                                "type": "array",
                                                "description": "List of actions that the vehicle can perform at the node. *Optional*.",
                                                "items": {
                                                    "type": "object",
                                                    "properties": {
                                                        "actionType": {
                                                            "type": "string",
                                                            "description": "Type of action (e.g., move, load, unload)."
                                                        },
                                                        "actionDescription": {
                                                            "type": "string",
                                                            "description": "Description of the action. *Optional*."
                                                        },
                                                        "required": {
                                                            "type": "boolean",
                                                            "description": "Whether the action is mandatory."
                                                        },
                                                        "blockingType": {
                                                            "type": "string",
                                                            "description": "Specifies if the action is blocking (HARD or SOFT)."
                                                        },
                                                        "actionParameters": {
                                                            "type": "array",
                                                            "description": "Parameters associated with the action. *Optional*.",
                                                            "items": {
                                                                "type": "object",
                                                                "properties": {
                                                                    "key": {
                                                                        "type": "string",
                                                                        "description": "Key of the action parameter."
                                                                    },
                                                                    "value": {
                                                                        "type": "string",
                                                                        "description": "Value of the action parameter."
                                                                    }
                                                                },
                                                                "required": [
                                                                    "key",
                                                                    "value"
                                                                ]
                                                            }
                                                        }
                                                    },
                                                    "required": [
                                                        "actionType",
                                                        "blockingType"
                                                    ]
                                                }
                                            }
                                        },
                                        "required": [
                                            "vehicleTypeId"
                                        ]
                                    }
                                }
                            },
                            "required": [
                                "nodeId",
                                "nodePosition",
                                "vehicleTypeNodeProperties"
                            ]
                        }
                    },
                    "edges": {
                        "type": "array",
                        "description": "List of edges in the layout. Edges represent paths between nodes.",
                        "items": {
                            "type": "object",
                            "properties": {
                                "edgeId": {
                                    "type": "string",
                                    "description": "Unique identifier for the edge."
                                },
                                "startNodeId": {
                                    "type": "string",
                                    "description": "ID of the starting node for this edge."
                                },
                                "endNodeId": {
                                    "type": "string",
                                    "description": "ID of the ending node for this edge."
                                },
                                "vehicleTypeEdgeProperties": {
                                    "type": "array",
                                    "description": "Vehicle-specific properties for the edge.",
                                    "items": {
                                        "type": "object",
                                        "properties": {
                                            "vehicleTypeId": {
                                                "type": "string",
                                                "description": "Identifier for the vehicle type."
                                            },
                                            "vehicleOrientation": {
                                                "type": "number",
                                                "description": "Orientation of the vehicle while traversing the edge, in degrees. Range: [0.0 ... 360.0]"
                                            },
                                            "orientationType": {
                                                "type": "string",
                                                "description": "Type of orientation (e.g., TANGENTIAL)."
                                            },
                                            "rotationAllowed": {
                                                "type": "boolean",
                                                "description": "Indicates if rotation is allowed while on the edge. *Optional*."
                                            },
                                            "rotationAtStartNodeAllowed": {
                                                "type": "string",
                                                "description": "Specifies if rotation is allowed at the start node. *Optional*."
                                            },
                                            "rotationAtEndNodeAllowed": {
                                                "type": "string",
                                                "description": "Specifies if rotation is allowed at the end node. *Optional*."
                                            },
                                            "maxSpeed": {
                                                "type": "number",
                                                "description": "Maximum speed allowed on this edge in meters per second. Range: [0.0 ... float64.max]"
                                            },
                                            "maxRotationSpeed": {
                                                "type": "number",
                                                "description": "Maximum rotation speed allowed on this edge in radians per second. *Optional*. Range: [0.0 ... float64.max]"
                                            },
                                            "minHeight": {
                                                "type": "number",
                                                "description": "Minimum height of the vehicle on this edge in meters. *Optional*. Range: [0.0 ... float64.max]"
                                            },
                                            "maxHeight": {
                                                "type": "number",
                                                "description": "Maximum height of the vehicle on this edge in meters. *Optional*. Range: [0.0 ... float64.max]"
                                            },
                                            "loadRestriction": {
                                                "type": "object",
                                                "description": "Load restrictions for this edge. *Optional*.",
                                                "properties": {
                                                    "unloaded": {
                                                        "type": "boolean",
                                                        "description": "Indicates if the edge can be traversed without a load."
                                                    },
                                                    "loaded": {
                                                        "type": "boolean",
                                                        "description": "Indicates if the edge can be traversed with a load."
                                                    },
                                                    "loadSetNames": {
                                                        "type": "array",
                                                        "description": "Names of the load sets allowed on this edge. *Optional*.",
                                                        "items": {
                                                            "type": "string"
                                                        }
                                                    }
                                                },
                                                "required": [
                                                    "unloaded",
                                                    "loaded"
                                                ]
                                            },
                                            "trajectory": {
                                                "type": "object",
                                                "description": "Trajectory information for this edge, if applicable. *Optional*.",
                                                "properties": {
                                                    "degree": {
                                                        "type": "integer",
                                                        "description": "Degree of the trajectory curve. Default is 3. Range: [1 ... 3]",
                                                        "default": 3
                                                    },
                                                    "knotVector": {
                                                        "type": "array",
                                                        "description": "Knot vector for the trajectory.",
                                                        "items": {
                                                            "type": "number"
                                                        }
                                                    },
                                                    "controlPoints": {
                                                        "type": "array",
                                                        "description": "Control points defining the trajectory.",
                                                        "items": {
                                                            "type": "object",
                                                            "properties": {
                                                                "x": {
                                                                    "type": "number",
                                                                    "description": "X coordinate of the control point in meters."
                                                                },
                                                                "y": {
                                                                    "type": "number",
                                                                    "description": "Y coordinate of the control point in meters."
                                                                },
                                                                "weight": {
                                                                    "type": "number",
                                                                    "description": "The weight with which this control point pulls on the curve. When not defined, the default is 1.0. Range: [0.0 ... float64.max]",
                                                                    "default": 1.0
                                                                }
                                                            },
                                                            "required": [
                                                                "x",
                                                                "y"
                                                            ]
                                                        }
                                                    }
                                                },
                                                "required": [
                                                    "knotVector",
                                                    "controlPoints"
                                                ]
                                            }
                                        },
                                        "required": [
                                            "vehicleTypeId"
                                        ]
                                    }
                                }
                            },
                            "required": [
                                "edgeId",
                                "startNodeId",
                                "endNodeId",
                                "vehicleTypeEdgeProperties"
                            ]
                        }
                    },
                    "stations": {
                        "type": "array",
                        "description": "List of stations in the layout where vehicles perform specific actions.",
                        "items": {
                            "type": "object",
                            "properties": {
                                "stationId": {
                                    "type": "string",
                                    "description": "Unique identifier for the station."
                                },
                                "interactionNodeIds": {
                                    "type": "array",
                                    "items": {
                                        "type": "string"
                                    },
                                    "description": "List of node IDs where the station interacts."
                                },
                                "stationName": {
                                    "type": "string",
                                    "description": "Name of the station. *Optional*."
                                },
                                "stationDescription": {
                                    "type": "string",
                                    "description": "Description of the station. *Optional*."
                                },
                                "stationHeight": {
                                    "type": "number",
                                    "description": "Height of the station, if applicable, in meters. *Optional*. Range: [0.0 ... float64.max]"
                                },
                                "stationPosition": {
                                    "type": "object",
                                    "description": "Position of the station on the map (in meters).",
                                    "properties": {
                                        "x": {
                                            "type": "number",
                                            "description": "X coordinate of the station in meters. Range: [float64.min ... float64.max]"
                                        },
                                        "y": {
                                            "type": "number",
                                            "description": "Y coordinate of the station in meters. Range: [float64.min ... float64.max]"
                                        },
                                        "theta": {
                                            "type": "number",
                                            "description": "Orientation of the station. Unit: radians. Range: [-Pi ... Pi]"
                                        }
                                    },
                                    "required": [
                                        "x",
                                        "y"
                                    ]
                                }
                            },
                            "required": [
                                "stationId",
                                "interactionNodeIds"
                            ]
                        }
                    }
                },
                "required": [
                    "layoutId",
                    "layoutVersion",
                    "nodes",
                    "edges",
                    "stations"
                ]
            }
        }
    },
    "required": [
        "metaInformation",
        "layouts"
    ]
}