{ "type": "object", "description": "The type of cargo item and the number of units.", "properties": { "symbol": { "type": "string", "description": "The unique identifier of the cargo item type." }, "name": { "type": "string", "description": "The name of the cargo item type." }, "units": { "type": "integer", "description": "The number of units of the cargo item.", "minimum": 1 } }, "required": [ "symbol", "name", "units" ] }