{
	"$schema": "http://json-schema.org/draft-07/schema#",
	"$id": "https://stac-extensions.github.io/ssys/v1.1.1/schema.json",
	"title": "SSYS Extension",
	"description": "STAC Solar System Extension for STAC Items, Catalogs, and Collections.",
	"oneOf": [
		{
			"$ref": "#/definitions/item"
		},
		{
			"$ref": "#/definitions/collection"
		},
		{
			"$ref": "#/definitions/catalog"
		}
	],
	"definitions": {
		"fields": {
			"type": "object",
			"description": "SSYS extension fields.",
			"properties": {
				"ssys:targets": {
					"description": "List of solar system targets relevant to the data.",
					"type": "array",
					"minItems": 1,
					"items": {
						"type": "string"
					}
				},
				"ssys:local_time": {
					"title": "Local Time",
					"description": "Local solar time at the observation target.",
					"type": "string"
				},
				"ssys:target_class": {
					"title": "Target Class",
					"description": "Classification of the observed target.",
					"type": "string",
					"enum": [
						"asteroid",
						"dwarf_planet",
						"planet",
						"satellite",
						"comet",
						"exoplanet",
						"interplanetary_medium",
						"sample",
						"sky",
						"spacecraft",
						"spacejunk",
						"star",
						"calibration"
					]
				}
			},
			"patternProperties": {
				"^(?!ssys:)": {}
			},
			"additionalProperties": false
		},
		"asset_fields": {
			"type": "object",
			"additionalProperties": {
				"$ref": "#/definitions/fields"
			}
		},
		"item": {
			"$comment": "Schema for STAC Items.",
			"type": "object",
			"required": [
				"type",
				"properties",
				"assets"
			],
			"properties": {
				"type": {
					"const": "Feature"
				},
				"properties": {
					"$ref": "#/definitions/fields"
				},
				"assets": {
					"$ref": "#/definitions/asset_fields"
				}
			}
		},
		"collection": {
			"$comment": "Schema for STAC Collections.",
			"type": "object",
			"required": [
				"type"
			],
			"properties": {
				"type": {
					"const": "Collection"
				},
				"assets": {
					"$ref": "#/definitions/asset_fields"
				},
				"item_assets": {
					"$ref": "#/definitions/asset_fields"
				}
			}
		},
		"catalog": {
			"$comment": "Schema for STAC Catalogs.",
			"type": "object",
			"required": [
				"type"
			],
			"properties": {
				"type": {
					"const": "Catalog"
				}
			},
			"allOf": [ 
				{ 
					"$ref": "#/definitions/fields" 
				} 
			]
		}
	}
}