{
    "$schema": "https://json-schema.org/draft/2019-09/schema",
    "title": "PolicySchema",
    "type": "object",
    "allOf": [
        {
            "$ref": "#/definitions/Policy"
        }
    ],
    "$id": "https://w3id.org/dspace/2024/1/negotiation/contract-schema.json",
    "definitions": {
        "Policy": {
            "oneOf": [
                {
                    "$ref": "#/definitions/MessageOffer"
                },
                {
                    "$ref": "#/definitions/Offer"
                },
                {
                    "$ref": "#/definitions/Agreement"
                }
            ]
        },
        "PolicyClass": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/AbstractPolicyRule"
                },
                {
                    "properties": {
                        "@id": {
                            "type": "string"
                        },
                        "odrl:profile": {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/Reference"
                            }
                        },
                        "odrl:permission": {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/Permission"
                            },
                            "minItems": 1
                        },
                        "odrl:obligation": {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/Duty"
                            },
                            "minItems": 1
                        }
                    },
                    "required": [
                        "@id"
                    ]
                }
            ]
        },
        "AbstractPolicyRule": {
            "properties": {
                "odrl:assigner": {
                    "type": "string"
                },
                "odrl:assignee": {
                    "type": "string"
                }
            }
        },
        "MessageOffer": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/PolicyClass"
                },
                {
                    "properties": {
                        "@type": {
                            "type": "string",
                            "const": "odrl:Offer"
                        }
                    }
                },
                {
                    "anyOf": [
                        {
                            "required": [
                                "odrl:permission"
                            ]
                        },
                        {
                            "required": [
                                "odrl:prohibition"
                            ]
                        }
                    ]
                }
            ],
            "required": [ "@type", "odrl:assigner" ]
        },
        "Offer": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/MessageOffer"
                }
            ],
            "not": { "required": [ "odrl:target" ] }
        },
        "Agreement": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/PolicyClass"
                },
                {
                    "properties": {
                        "@type": {
                            "type": "string",
                            "const": "odrl:Agreement"
                        },
                        "@id": {
                            "type": "string"
                        },
                        "odrl:target": {
                            "type": "string"
                        },
                        "dspace:timestamp": {
                            "type": "string",
                            "pattern": "-?([1-9][0-9]{3,}|0[0-9]{3})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])T(([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](\\.[0-9]+)?|(24:00:00(\\.0+)?))(Z|(\\+|-)((0[0-9]|1[0-3]):[0-5][0-9]|14:00))?" 
                        }
                    }
                },
                {
                    "anyOf": [
                        {
                            "required": [
                                "odrl:permission"
                            ]
                        },
                        {
                            "required": [
                                "odrl:prohibition"
                            ]
                        }
                    ]
                }
            ],
            "required": [
                "@type",
                "@id",
                "odrl:target",
                "odrl:assignee", 
                "odrl:assigner"
            ]
        },
        "RuleClass": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/AbstractPolicyRule"
                },
                {
                    "properties": {
                        "odrl:action": {
                            "$ref": "#/definitions/Action"
                        },
                        "odrl:constraint": {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/Constraint"
                            },
                            "minItems": 1
                        }
                    }
                }
            ],
            "required": [
                "odrl:action"
            ]
        },
        "Permission": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/AbstractPolicyRule"
                },
                {
                    "properties": {
                        "odrl:action": {
                            "$ref": "#/definitions/Action"
                        },
                        "odrl:constraint": {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/Constraint"
                            },
                            "minItems": 1
                        },
                        "odrl:duty": {
                            "$ref": "#/definitions/Duty"
                        }
                    },
                    "required": [
                        "odrl:action"
                    ]
                }
            ]
        },
        "Duty": {
            "type": "object",
            "allOf": [
                {
                    "$ref": "#/definitions/AbstractPolicyRule"
                },
                {
                    "properties": {
                        "@id": {
                            "type": "string"
                        },
                        "odrl:action": {
                            "$ref": "#/definitions/Action"
                        },
                        "odrl:constraint": {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/Constraint"
                            }
                        }
                    },
                    "required": [
                        "odrl:action"
                    ]
                }
            ]
        },
        "Action": {
            "type": "string",
            "enum": [
                "odrl:delete",
                "odrl:execute",
                "cc:SourceCode",
                "odrl:anonymize",
                "odrl:extract",
                "odrl:read",
                "odrl:index",
                "odrl:compensate",
                "odrl:sell",
                "odrl:derive",
                "odrl:ensureExclusivity",
                "odrl:annotate",
                "cc:Reproduction",
                "odrl:translate",
                "odrl:include",
                "cc:DerivativeWorks",
                "cc:Distribution",
                "odrl:textToSpeech",
                "odrl:inform",
                "odrl:grantUse",
                "odrl:archive",
                "odrl:modify",
                "odrl:aggregate",
                "odrl:attribute",
                "odrl:nextPolicy",
                "odrl:digitize",
                "cc:Attribution",
                "odrl:install",
                "odrl:concurrentUse",
                "odrl:distribute",
                "odrl:synchronize",
                "odrl:move",
                "odrl:obtainConsent",
                "odrl:print",
                "cc:Notice",
                "odrl:give",
                "odrl:uninstall",
                "cc:Sharing",
                "odrl:reviewPolicy",
                "odrl:watermark",
                "odrl:play",
                "odrl:reproduce",
                "odrl:transform",
                "odrl:display",
                "odrl:stream",
                "cc:ShareAlike",
                "odrl:acceptTracking",
                "cc:CommericalUse",
                "odrl:present",
                "odrl:use"
            ]
        },
        "Constraint": {
            "type": "object",
            "properties": {
                "odrl:rightOperand": {
                    "$ref": "#/definitions/RightOperand"
                },
                "odrl:rightOperandReference": {
                    "$ref": "#/definitions/Reference"
                },
                "odrl:leftOperand": {
                    "$ref": "#/definitions/LeftOperand"
                },
                "odrl:operator": {
                    "$ref": "#/definitions/Operator"
                }
            }
        },
        "Operator": {
            "type": "string",
            "enum": [
                "odrl:eq",
                "odrl:gt",
                "odrl:gteq",
                "odrl:hasPart",
                "odrl:isA",
                "odrl:isAllOf",
                "odrl:isAnyOf",
                "odrl:isNoneOf",
                "odrl:isPartOf",
                "odrl:lt",
                "odrl:term-lteq",
                "odrl:neq"
            ]
        },
        "RightOperand": {},
        "LeftOperand": {
            "type": "string",
            "enum": [
                "odrl:absolutePosition",
                "odrl:absoluteSize",
                "odrl:absoluteSpatialPosition",
                "odrl:absoluteTemporalPosition",
                "odrl:count",
                "odrl:dateTime",
                "odrl:delayPeriod",
                "odrl:deliveryChannel",
                "odrl:device",
                "odrl:elapsedTime",
                "odrl:event",
                "odrl:fileFormat",
                "odrl:industry",
                "odrl:language",
                "odrl:media",
                "odrl:meteredTime",
                "odrl:payAmount",
                "odrl:percentage",
                "odrl:product",
                "odrl:purpose",
                "odrl:recipient",
                "odrl:relativePosition",
                "odrl:relativeSize",
                "odrl:relativeSpatialPosition",
                "odrl:relativeTemporalPosition",
                "odrl:resolution",
                "odrl:spatial",
                "odrl:spatialCoordinates",
                "odrl:system",
                "odrl:systemDevice",
                "odrl:timeInterval",
                "odrl:unitOfCount",
                "odrl:version",
                "odrl:virtualLocation"
            ]
        },
        "Reference": {
            "type": "object",
            "properties": {
                "@id": {
                    "type": "string"
                }
            },
            "required": [
                "@id"
            ]
        }
    }
}