{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/eurostat/main/json-schema/eurostat-data-query.json",
  "title": "Eurostat Data Query Parameters",
  "description": "JSON Schema for Eurostat Statistics API data query parameters and response structure.",
  "type": "object",
  "properties": {
    "datasetCode": {
      "type": "string",
      "description": "The Eurostat dataset code (e.g., nama_10_gdp, demo_gind, env_air_gge).",
      "examples": ["nama_10_gdp", "demo_gind", "env_air_gge", "tec00001"]
    },
    "format": {
      "type": "string",
      "description": "Response format for the Statistics API.",
      "enum": ["JSON", "TSV"],
      "default": "JSON"
    },
    "lang": {
      "type": "string",
      "description": "Language code for labels in the response.",
      "enum": ["en", "fr", "de"],
      "default": "en"
    },
    "sinceTimePeriod": {
      "type": "string",
      "description": "Start time period filter (e.g., 2010, 2010Q1, 2010-01).",
      "examples": ["2010", "2015Q1", "2020-01"]
    },
    "untilTimePeriod": {
      "type": "string",
      "description": "End time period filter (e.g., 2023, 2023Q4, 2023-12).",
      "examples": ["2023", "2023Q4", "2023-12"]
    },
    "lastTimePeriod": {
      "type": "integer",
      "description": "Number of most recent time periods to return.",
      "minimum": 1,
      "examples": [1, 5, 10]
    }
  },
  "definitions": {
    "JsonStatResponse": {
      "type": "object",
      "description": "JSON-stat 2.0 response from the Eurostat Statistics API.",
      "properties": {
        "version": {
          "type": "string",
          "description": "JSON-stat version.",
          "example": "2.0"
        },
        "class": {
          "type": "string",
          "enum": ["dataset"],
          "description": "JSON-stat class identifier."
        },
        "href": {
          "type": "string",
          "format": "uri",
          "description": "The canonical URL for this dataset."
        },
        "label": {
          "type": "string",
          "description": "Human-readable label for the dataset."
        },
        "source": {
          "type": "string",
          "description": "The data source (Eurostat)."
        },
        "updated": {
          "type": "string",
          "format": "date-time",
          "description": "Last update timestamp."
        },
        "id": {
          "type": "array",
          "items": { "type": "string" },
          "description": "Ordered list of dimension identifiers."
        },
        "size": {
          "type": "array",
          "items": { "type": "integer" },
          "description": "Number of elements in each dimension."
        },
        "dimension": {
          "type": "object",
          "description": "Dimension definitions keyed by dimension ID.",
          "additionalProperties": {
            "type": "object",
            "properties": {
              "label": { "type": "string" },
              "category": {
                "type": "object",
                "properties": {
                  "index": {
                    "type": "object",
                    "additionalProperties": { "type": "integer" }
                  },
                  "label": {
                    "type": "object",
                    "additionalProperties": { "type": "string" }
                  }
                }
              }
            }
          }
        },
        "value": {
          "oneOf": [
            {
              "type": "array",
              "items": { "type": ["number", "null"] }
            },
            {
              "type": "object",
              "additionalProperties": { "type": ["number", "null"] }
            }
          ],
          "description": "Data values in row-major order or sparse object notation."
        },
        "status": {
          "oneOf": [
            {
              "type": "object",
              "additionalProperties": { "type": "string" }
            }
          ],
          "description": "Status flags for data cells (e.g., 'b' for break, 'p' for provisional)."
        },
        "extension": {
          "type": "object",
          "description": "Eurostat-specific extensions to JSON-stat.",
          "properties": {
            "datasetId": { "type": "string" },
            "lang": { "type": "string" },
            "description": { "type": "string" }
          }
        }
      },
      "required": ["version", "class", "id", "size", "dimension", "value"]
    },
    "AsyncStatusResponse": {
      "type": "object",
      "description": "Status of an asynchronous data extraction request.",
      "properties": {
        "key": {
          "type": "string",
          "format": "uuid",
          "description": "Unique identifier for the async request."
        },
        "status": {
          "type": "string",
          "enum": ["SUBMITTED", "PROCESSING", "AVAILABLE", "EXPIRED"],
          "description": "Current processing status of the async request."
        }
      },
      "required": ["key", "status"]
    },
    "SdmxFlow": {
      "type": "string",
      "description": "SDMX flow identifier in the format [agency,]id[,version].",
      "pattern": "^([a-zA-Z][a-zA-Z\\d_-]*(\\.[a-zA-Z][a-zA-Z\\d_-]*)*,)?[a-zA-Z\\d_@$-]+(,(latest|(\\d+(\\.\\d+)*)))?$",
      "examples": ["ESTAT,nama_10_gdp", "nama_10_gdp", "ESTAT,demo_gind,1.0"]
    },
    "SdmxKey": {
      "type": "string",
      "description": "SDMX dimension key for filtering data series.",
      "pattern": "^([\\. A-Za-z\\d_@$-]+(\\+[A-Za-z\\d_@$-]+)*)*$",
      "examples": ["M.DE.000000.ANR", "A+M.DE.000000.ANR", "all"]
    }
  }
}