* Example: {z : 33, $and : [ {$or : [{a : 1}, {b : 2}]}, {$or : [{c : 5}, {d : 7}]} ] }
*
* - Mongodb $(projection) operator supported. (http://docs.mongodb.org/manual/reference/projection/positional/#proj._S_)
- * - Mongodb positional $ update operator supported. (http://docs.mongodb.org/manual/reference/operator/positional/)
+ * - Mongodb positional $ update operator supported. (http://docs.mongodb.org/manual/reference/operator/positional/)
*
*
* - Queries can be used to update records: