{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://stac-extensions.github.io/processing/v1.3.0/schema.json#",
  "title": "Processing Extension",
  "description": "STAC Processing Extension for STAC Items and STAC Collections.",
  "type": "object",
  "required": [
    "stac_extensions",
    "type"
  ],
  "properties": {
    "stac_extensions": {
      "type": "array",
      "contains": {
        "const": "https://stac-extensions.github.io/processing/v1.3.0/schema.json"
      }
    },
    "type": {
      "type": "string",
      "enum": [
        "Collection",
        "Feature"
      ]
    },
    "assets": {
      "$comment": "This validates the fields in Item and Collection Assets, but does not require them.",
      "type": "object",
      "additionalProperties": {
        "$ref": "#/definitions/fieldsAndProviders"
      }
    },
    "assetTemplates": {
      "$comment": "This validates the fields in Asset Templates, but does not require them.",
      "type": "object",
      "additionalProperties": {
        "$ref": "#/definitions/fieldsAndProviders"
      }
    }
  },
  "oneOf": [
    {
      "$comment": "This is the schema for STAC Items.",
      "type": "object",
      "required": [
        "type",
        "properties"
      ],
      "properties": {
        "type": {
          "const": "Feature"
        },
        "properties": {
          "$ref": "#/definitions/fieldsAndProviders"
        }
      }
    },
    {
      "$comment": "This is the schema for STAC Collections.",
      "type": "object",
      "required": [
        "type"
      ],
      "properties": {
        "type": {
          "const": "Collection"
        },
        "providers": {
          "$ref": "#/definitions/providers"
        },
        "summaries": {
          "$ref": "#/definitions/summaries"
        },
        "item_assets": {
          "type": "object",
          "additionalProperties": {
            "$ref": "#/definitions/fieldsAndProviders"
          }
        }
      }
    }
  ],
  "definitions": {
    "processing:expression": {
      "title": "Processing Expression",
      "type": "object",
      "required": [
        "format",
        "expression"
      ],
      "properties": {
        "format": {
          "type": "string"
        },
        "expression": {
          "description": "Any data type, depending on the format chosen."
        }
      }
    },
    "processing:lineage": {
      "title": "Processing Lineage Information",
      "type": "string",
      "examples": [
        "Post Processing GRD"
      ]
    },
    "processing:level": {
      "title": "Processing Level",
      "type": "string",
      "examples": [
        "RAW",
        "L1",
        "L1A",
        "L1B",
        "L1C",
        "L2",
        "L2A",
        "L3",
        "L4"
      ]
    },
    "processing:facility": {
      "title": "Processing Facility",
      "type": "string",
      "examples": [
        "Copernicus S1 Core Ground Segment - DPA"
      ]
    },
    "processing:version": {
      "title": "Processing Version",
      "type": "string",
      "examples": [
        "0.2.0"
      ]
    },
    "processing:datetime": {
      "title": "Processing Datetime",
      "type": "string",
      "format": "date-time",
      "pattern": "(\\+00:00|Z)$",
      "examples": [
        "2020-01-05T12:34:55Z"
      ]
    },
    "processing:software": {
      "title": "Processing Software Name / version",
      "type": "object",
      "patternProperties": {
        ".{1,}": {
          "type": "string"
        }
      },
      "examples": [
        {
          "Sentinel-1 IPF": "002.71"
        }
      ]
    },
    "processing:datastrip_id": {
      "title": "Datastrip ID",
      "type": "string",
      "minLength": 1,
      "examples": [
        "S2A_OPER_MSI_L2A_DS_2APS_20250626T142217_S20250626T102649_N05.11"
      ]
    },
    "fields": {
      "$comment": "Don't require fields here as they would be required in all places where the fields are referenced.",
      "type": "object",
      "properties": {
        "processing:expression": {
          "$ref": "#/definitions/processing:expression"
        },
        "processing:lineage": {
          "$ref": "#/definitions/processing:lineage"
        },
        "processing:level": {
          "$ref": "#/definitions/processing:level"
        },
        "processing:facility": {
          "$ref": "#/definitions/processing:facility"
        },
        "processing:version": {
          "$ref": "#/definitions/processing:version"
        },
        "processing:datetime": {
          "$ref": "#/definitions/processing:datetime"
        },
        "processing:software": {
          "$ref": "#/definitions/processing:software"
        },
        "processing:datastrip_id": {
          "$ref": "#/definitions/processing:datastrip_id"
        }
      },
      "patternProperties": {
        "^(?!processing:)": {}
      },
      "additionalProperties": false
    },
    "providers": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/fields"
      }
    },
    "fieldsAndProviders": {
      "allOf": [
        {
          "$ref": "#/definitions/fields"
        },
        {
          "properties": {
            "providers": {
              "$ref": "#/definitions/providers"
            }
          }
        }
      ]
    },
    "summaries": {
      "$comment": "These are examples summaries that allows lists, ranges and JSON schemas, depending on how it makes sense for the individual data types of the fields. Validation only works for lists and ranges. JSON Schema (type: object) can always be provided for fields, but the corresponding schema for lists (type: array and items) and ranges (properties) should only be provided if it actually makes sense.",
      "type": "object",
      "properties": {
        "processing:expression": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:expression"
          }
        },
        "processing:lineage": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:lineage"
          }
        },
        "processing:level": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:level"
          },
          "properties": {
            "minimum": {
              "$ref": "#/definitions/processing:level"
            },
            "maximum": {
              "$ref": "#/definitions/processing:level"
            }
          }
        },
        "processing:facility": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:facility"
          }
        },
        "processing:version": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:version"
          },
          "properties": {
            "minimum": {
              "$ref": "#/definitions/processing:version"
            },
            "maximum": {
              "$ref": "#/definitions/processing:version"
            }
          }
        },
        "processing:datetime": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:datetime"
          },
          "properties": {
            "minimum": {
              "$ref": "#/definitions/processing:datetime"
            },
            "maximum": {
              "$ref": "#/definitions/processing:datetime"
            }
          }
        },
        "processing:software": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:software"
          }
        },
        "processing:datastrip_id": {
          "type": ["array", "object"],
          "items": {
            "$ref": "#/definitions/processing:datastrip_id"
          }
        }
      },
      "patternProperties": {
        "^(?!processing:)": {}
      },
      "additionalProperties": false
    }
  }
}