{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "$id": "https://raw.githubusercontent.com/hubverse-org/schemas/main/v6.0.0/target-data-schema.json",
    "title": "Schema for Modeling Hub target data definitions",
    "description": "This is the schema of the target-data.json configuration file that defines metadata about target data used to visualise and evaluate modeling hub model outputs.",
    "type": "object",
    "properties": {
        "schema_version": {
            "description": "URL to a version of the Modeling Hub schema target-data-schema.json file (see https://github.com/hubverse-org/schemas). Used to declare the schema version a 'target-data.json' file is written for and for config file validation. The URL provided should be the URL to the raw content of the schema file on GitHub.",
            "examples": [
                "https://raw.githubusercontent.com/hubverse-org/schemas/main/v6.0.0/target-data-schema.json"
            ],
            "type": "string",
            "format": "uri"
        },
        "observable_unit": {
            "description": "Names of columns whose unique value combinations define the minimum observable unit across all target type data. Each combination of values must be unique (and in time-series data also unique across `as_of` data versions if applicable). The majority are expected to correspond to task ID names but may include other columns as well (e.g., the `date_col` column).",
            "type": "array",
            "uniqueItems": true,
            "items": {
                "type": "string"
            }
        },
        "date_col": {
            "description": "Name of the date column across hub data (time-series, oracle-output and model-output if present). This is the column that stores the date on which observed data actually occurred.",
            "type": "string"
        },
        "versioned": {
            "description": "Indicates whether all target type datasets are versioned using `as_of` dates by default. If true, both time-series and oracle-output data are expected to have a date `as_of` column that indicates the version of each data point. Can be overridden at the dataset level.",
            "type": "boolean",
            "default": false
        },
        "time-series": {
            "type": "object",
            "properties": {
                "non_task_id_schema": {
                    "type": "object",
                    "description": "Key-value pairs of non-task ID column names and data types found in time-series data. Include any columns in the time-series data that do not correspond exactly to a task ID. The `as_of` column does not need to be defined here as it is a reserved column.",
                    "examples": [
                        {
                            "location_name": "character"
                        },
                        {
                            "population": "integer"
                        }
                    ],
                    "additionalProperties": {
                        "type": "string",
                        "enum": [
                            "character",
                            "double",
                            "integer",
                            "logical",
                            "Date"
                        ]
                    }
                },
                "observable_unit": {
                    "description": "Names of columns whose unique value combinations define the minimum observable unit for time-series data. Each combination of values must be unique across `as_of` data versions if applicable. The majority are expected to correspond to task ID names but may include other columns as well (e.g., the `date_col` column). If not specified or null, uses the global `observable_unit`.",
                    "type": [
                        "array",
                        "null"
                    ],
                    "uniqueItems": true,
                    "items": {
                        "type": "string"
                    },
                    "default": null
                },
                "versioned": {
                    "description": "Indicates whether time-series data are versioned using `as_of` dates. If true, the data is expected to have a date `as_of` column that indicates the version of each data point. If not specified, inherits from the global `versioned` setting.",
                    "type": "boolean"
                }
            },
            "additionalProperties": false
        },
        "oracle-output": {
            "type": "object",
            "properties": {
                "has_output_type_ids": {
                    "type": "boolean",
                    "description": "Indicates whether the oracle-output data have an `output_type` and `output_type_id` column. These columns are necessary if hub includes `pmf` and `cdf` output types but optional otherwise.",
                    "default": false
                },
                "observable_unit": {
                    "description": "Names of task IDs whose unique value combinations define an observable unit in oracle-output data. Each combination of values must be unique once combined with output type IDs if present. Use to override the global `observable_unit` in situations where some output types require additional task ID values to map onto target data. If not specified or null, uses the global `observable_unit`.",
                    "type": [
                        "array",
                        "null"
                    ],
                    "uniqueItems": true,
                    "items": {
                        "type": "string"
                    },
                    "default": null
                },
                "versioned": {
                    "description": "Indicates whether oracle-output data are versioned using `as_of` dates. If true, the data is expected to have a date `as_of` column that indicates the version of each data point. If not specified, inherits from the global `versioned` setting.",
                    "type": "boolean"
                }
            },
            "additionalProperties": false
        },
        "additional_metadata": {
            "description": "Optional property in which any type of custom metadata can be stored.",
            "type": "object",
            "additionalProperties": true
        }
    },
    "required": [
        "schema_version",
        "observable_unit",
        "date_col"
    ],
    "additionalProperties": false
}