--- /dev/null
+{
+ "$schema": "http://json-schema.org/draft-04/schema#",
+ "title": "Field Modifier",
+ "description": "Polito Field Modifier",
+ "type": "array",
+ "items": {
+ "type": "object"
+ },
+ "minItems": 0,
+ "maxItems":0,
+ "uniqueItems": true
+}
\ No newline at end of file