{
	"$schema": "http://json-schema.org/draft-07/schema#",
	"$id": "https://stac-extensions.github.io/ssys/v1.1.0/schema.json",
	"title": "SSYS Extension",
	"description": "STAC Solar System Extension for STAC Items, Catalogs, or Collections.",
	"oneOf": [
		{
			"$comment": "This is the schema for STAC Items.",
			"allOf": [
				{
					"$ref": "#/definitions/stac_extensions"
				},
				{
					"type": "object",
					"required": [
						"type",
						"properties",
						"assets"
					],
					"properties": {
						"type": {
							"const": "Feature"
						},
						"properties": {
							"$ref": "#/definitions/fields"
						},
						"assets": {
							"type": "object",
							"additionalProperties": {
								"$ref": "#/definitions/fields"
							}
						}
					}
				}
			]
		},
		{
			"$comment": "This is the schema for STAC Collections.",
			"allOf": [
				{
					"type": "object",
					"required": [
						"type"
					],
					"properties": {
						"type": {
							"const": "Collection"
						},
						"assets": {
							"type": "object",
							"additionalProperties": {
								"$ref": "#/definitions/fields"
							}
						},
						"item_assets": {
							"type": "object",
							"additionalProperties": {
								"$ref": "#/definitions/fields"
							}
						}
					}
				},
				{
					"$ref": "#/definitions/stac_extensions"
				}
			]
		}
	],
	"definitions": {
		"stac_extensions": {
			"type": "object",
			"required": [
				"stac_extensions"
			],
			"properties": {
				"stac_extensions": {
					"type": "array",
					"contains": {
						"const": "https://stac-extensions.github.io/ssys/v1.1.0/schema.json"
					}
				}
			}
		},
		"fields": {
			"type": "object",
			"properties": {
				"ssys:targets": {
					"type": "array",
					"minItems": 1,
					"items": {
						"type": "string"
					}
				},
				"ssys:local_time": {
					"title": "Local time",
					"type": "string"
				},
				"ssys:target_class": {
					"title": "target_class",
					"type": "string",
					"enum": ["asteroid", 
					         "dwarf_planet", 
							 "planet", 
							 "satellite", 
							 "comet", 
							 "exoplanet", 
							 "interplanetary_medium", 
							 "sample", 
							 "sky", 
							 "spacecraft", 
							 "spacejunk", 
							 "star", 
							 "calibration"]
				}
			},
			"patternProperties": {
				"^(?!ssys:)": {}
			},
			"additionalProperties": false
		}
	}
}