{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/dlr/refs/heads/main/json-schema/eoc-stac-api.json",
  "title": "DLR EOC STAC API Schema",
  "description": "JSON Schema for the DLR Earth Observation Center STAC API, covering collections, items, and search requests.",
  "definitions": {
    "link": {
      "type": "object",
      "required": ["href"],
      "properties": {
        "href": { "type": "string", "format": "uri" },
        "rel": { "type": "string" },
        "type": { "type": "string" },
        "title": { "type": "string" },
        "hreflang": { "type": "string" }
      }
    },
    "extent": {
      "type": "object",
      "properties": {
        "spatial": {
          "type": "object",
          "properties": {
            "bbox": {
              "type": "array",
              "items": {
                "type": "array",
                "items": { "type": "number" },
                "minItems": 4,
                "maxItems": 6
              }
            }
          }
        },
        "temporal": {
          "type": "object",
          "properties": {
            "interval": {
              "type": "array",
              "items": {
                "type": "array",
                "items": { "type": ["string", "null"] },
                "minItems": 2,
                "maxItems": 2
              }
            }
          }
        }
      }
    },
    "collection": {
      "type": "object",
      "required": ["id", "links", "extent", "license"],
      "properties": {
        "id": { "type": "string" },
        "title": { "type": "string" },
        "description": { "type": "string" },
        "license": { "type": "string" },
        "extent": { "$ref": "#/definitions/extent" },
        "links": {
          "type": "array",
          "items": { "$ref": "#/definitions/link" }
        },
        "stac_version": { "type": "string" },
        "stac_extensions": {
          "type": "array",
          "items": { "type": "string" }
        }
      }
    },
    "item": {
      "type": "object",
      "required": ["type", "stac_version", "id", "links", "assets", "geometry", "bbox", "properties"],
      "properties": {
        "type": { "type": "string", "enum": ["Feature"] },
        "stac_version": { "type": "string" },
        "stac_extensions": {
          "type": "array",
          "items": { "type": "string" }
        },
        "id": { "type": "string" },
        "geometry": {
          "oneOf": [
            { "type": "null" },
            { "$ref": "#/definitions/geometryGeoJSON" }
          ]
        },
        "bbox": {
          "type": "array",
          "items": { "type": "number" },
          "minItems": 4,
          "maxItems": 6
        },
        "properties": {
          "type": "object",
          "required": ["datetime"],
          "properties": {
            "datetime": { "type": ["string", "null"], "format": "date-time" },
            "created": { "type": "string", "format": "date-time" },
            "updated": { "type": "string", "format": "date-time" },
            "start_datetime": { "type": "string", "format": "date-time" },
            "end_datetime": { "type": "string", "format": "date-time" },
            "platform": { "type": "string" },
            "instruments": {
              "type": "array",
              "items": { "type": "string" }
            },
            "constellation": { "type": "string" },
            "mission": { "type": "string" },
            "gsd": { "type": "number" }
          }
        },
        "links": {
          "type": "array",
          "items": { "$ref": "#/definitions/link" }
        },
        "assets": {
          "type": "object",
          "additionalProperties": {
            "type": "object",
            "required": ["href"],
            "properties": {
              "href": { "type": "string", "format": "uri" },
              "title": { "type": "string" },
              "description": { "type": "string" },
              "type": { "type": "string" },
              "roles": {
                "type": "array",
                "items": { "type": "string" }
              }
            }
          }
        },
        "collection": { "type": "string" }
      }
    },
    "geometryGeoJSON": {
      "oneOf": [
        { "$ref": "#/definitions/pointGeoJSON" },
        { "$ref": "#/definitions/linestringGeoJSON" },
        { "$ref": "#/definitions/polygonGeoJSON" },
        { "$ref": "#/definitions/multipointGeoJSON" },
        { "$ref": "#/definitions/multilinestringGeoJSON" },
        { "$ref": "#/definitions/multipolygonGeoJSON" },
        { "$ref": "#/definitions/geometrycollectionGeoJSON" }
      ]
    },
    "pointGeoJSON": {
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": { "type": "string", "enum": ["Point"] },
        "coordinates": { "type": "array", "minItems": 2, "items": { "type": "number" } }
      }
    },
    "linestringGeoJSON": {
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": { "type": "string", "enum": ["LineString"] },
        "coordinates": { "type": "array", "minItems": 2, "items": { "type": "array", "minItems": 2, "items": { "type": "number" } } }
      }
    },
    "polygonGeoJSON": {
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": { "type": "string", "enum": ["Polygon"] },
        "coordinates": { "type": "array", "items": { "type": "array", "minItems": 4, "items": { "type": "array", "minItems": 2, "items": { "type": "number" } } } }
      }
    },
    "multipointGeoJSON": {
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": { "type": "string", "enum": ["MultiPoint"] },
        "coordinates": { "type": "array", "items": { "type": "array", "minItems": 2, "items": { "type": "number" } } }
      }
    },
    "multilinestringGeoJSON": {
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": { "type": "string", "enum": ["MultiLineString"] },
        "coordinates": { "type": "array", "items": { "type": "array", "minItems": 2, "items": { "type": "array", "minItems": 2, "items": { "type": "number" } } } }
      }
    },
    "multipolygonGeoJSON": {
      "type": "object",
      "required": ["type", "coordinates"],
      "properties": {
        "type": { "type": "string", "enum": ["MultiPolygon"] },
        "coordinates": { "type": "array", "items": { "type": "array", "items": { "type": "array", "minItems": 4, "items": { "type": "array", "minItems": 2, "items": { "type": "number" } } } } }
      }
    },
    "geometrycollectionGeoJSON": {
      "type": "object",
      "required": ["type", "geometries"],
      "properties": {
        "type": { "type": "string", "enum": ["GeometryCollection"] },
        "geometries": { "type": "array", "items": { "$ref": "#/definitions/geometryGeoJSON" } }
      }
    },
    "searchBody": {
      "type": "object",
      "properties": {
        "bbox": {
          "type": "array",
          "items": { "type": "number" },
          "minItems": 4,
          "maxItems": 6
        },
        "datetime": { "type": "string" },
        "intersects": { "$ref": "#/definitions/geometryGeoJSON" },
        "ids": { "type": "array", "items": { "type": "string" } },
        "collections": { "type": "array", "items": { "type": "string" } },
        "limit": { "type": "integer", "minimum": 1, "maximum": 10000 },
        "fields": {
          "type": "object",
          "properties": {
            "include": { "type": "array", "items": { "type": "string" } },
            "exclude": { "type": "array", "items": { "type": "string" } }
          }
        },
        "sortby": {
          "type": "array",
          "items": {
            "type": "object",
            "required": ["field", "direction"],
            "properties": {
              "field": { "type": "string" },
              "direction": { "type": "string", "enum": ["asc", "desc"] }
            }
          }
        },
        "filter": { "type": "object" },
        "filter-lang": { "type": "string" }
      }
    }
  },
  "type": "object",
  "properties": {
    "collection": { "$ref": "#/definitions/collection" },
    "item": { "$ref": "#/definitions/item" },
    "searchBody": { "$ref": "#/definitions/searchBody" }
  }
}