{ "$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"] }