+ * Field - {@link UserSet#getIdentifier()}
+ * As Identifier is always null, we fetch the value from the 'id' field in the response
+ * exmaple : 'id' : http://data.europeana.eu/set/xyz , identifier : xyz
+ *
+ * @author srishti singh
+ * @since 9 December 2024
+ */
+public class UserSetDeserializer extends JsonDeserializer