{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "description": "An issued identifier",
    "properties": {
        "scheme": {
            "type": "string",
            "title": "Scheme"
        },
        "identifier": {
            "type": "string",
            "title": "Identifier"
        }
    },
    "title": "Identifier"
}