schemaKeys.json

{
	"id": "https://www.elixir-europe.org/excelerate/WP2/json-schemas/0.3/SchemaKeys",
	"$schema": "http://json-schema.org/draft-04/hyper-schema#",
	"title": "Relational information not included in standard Json Schema",
	"type": "object",
	"properties": {
		"_id": {
                    "title": "Data Type id. It should correspond to a valid schema in the repository",
        		"type": "string",
			"minLength": 1
		},
		"_schema": {
			"title": "The JSON schema absolute URI. It must match the value of 'id' in the JSON schema",
			"type": "string",
			"format": "uri",
			"enum": [ "https://www.elixir-europe.org/excelerate/WP2/json-schemas/0.3/SchemaKeys" ]
		},
                "primary_key" : {
                    "type": "string",
                    "title": "property used as primary key, defaults to _id in MongoDB implementation",
                    "default": "_id"
                },
                "foreign_keys" : {
                    "title": "Properties used as pseudo relational type FKs",
                    "type": "array",
                    "items" : {
                        "type": "object",
                        "properties": {
                            "collection" : {
                                "title": "Collection where FK is referred. It should correspond to a valid schema in the repository",
                                "type": "string" 
                            },
                            "fields" : {
                                "title": "fields used as keys, usually _id",
                                "type": "array",
                                "minItems":1,
                                "items" : {
                                    "type": "string"
                                }
                            }
                        }
                    }
                }
	},
	"additionalProperties": false,
	"required": ["_id","_schema"]
}