{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "The description of license data",
    "type":"object",
    "properties": {
        "title":{
            "description": "The title of this license. The value is a quoted string followed by '@' and a 2 letter language code",
            "type": "string",
            "pattern": "\".*\"@[a-z][a-z]"
        },
        "licenseUrl": {
            "description": "The URL where a description of this certification can be found",
            "type": "string",
            "format": "uri"
        },
        "startDate": {
            "description": "The date at which this data is subject to the license",
            "type": "string",
            "format": "date"
        },
        "endDate": {
            "description": "The date at which this data is no longer subject to the license",
            "type": "string",
            "format": "date"
        }
    },

    "required": ["title","certificationUrl","startDate","endDate"]
}