{
    "$schema": "http://json-schema.org/hyper-schema#",
    "title": "Provenance Aspect",
    "description": "Describes how this data was collected or generated.",
    "type": "object",
    "properties": {
        "mechanism": {
            "description": "How was it produced?",
            "type": "string"
        },
        "sourceSystem": {
            "description": "What system, if any, was used to produce the data?",
            "type": "string"
        },
        "derivedFrom": {
            "description": "What other dataset(s), if any, was this data derived from?",
            "type": "array",
            "items": {
                "type": "object",
                "description": "The dataset that this data was derived from - either a link to another record in Magda or a name if the dataset isn't in Magda",
                "properties": {
                    "id": {
                        "type": "array",
                        "maxItems": 1,
                        "items": {
                            "type": "string",
                            "description": "This is an array because Magda doesn't properly support single values for links.",
                            "links": [
                                {
                                    "href": "/api/v0/registry/records/{$}",
                                    "rel": "item"
                                }
                            ]
                        }
                    },
                    "name": {
                        "type": "string",
                        "description": "If the dataset isn't in Magda, the name of the dataset that the data was derived from."
                    }
                },
                "oneOf": [
                    {
                        "required": ["id"],
                        "not": {
                            "required": ["name"]
                        }
                    },
                    {
                        "required": ["name"],
                        "not": {
                            "required": ["id"]
                        }
                    }
                ]
            }
        },
        "affiliatedOrganizationIds": {
            "description": "Which other organisation(s), if any, was this produced in collaboration with?",
            "type": "array",
            "items": {
                "type": "string",
                "links": [
                    {
                        "href": "/api/v0/registry/records/{$}",
                        "rel": "item"
                    }
                ]
            }
        },
        "isOpenData": {
            "description": "Is it already released as open data?",
            "type": "boolean"
        }
    }
}