| GGBoolean | The Booleanscalar type representstrueorfalse. | 
| GGFloat | The  Float scalar type represents signed double-precision fractional values as specified by IEEE 754 . | 
| GGID | The IDscalar type represents a unique identifier, often used to
 refetch an object or as key for a cache. | 
| GGInt | The Intscalar type represents non-fractional signed whole numeric
 values. | 
| GGJSON | The  JSON scalar type represents JSON values as specified by
 ECMA-404 . | 
| GGString | The Stringscalar type represents textual data, represented as UTF-8
 character sequences. | 
| GGTimestamp | Represents a Unix Timestamp. | 
| Scalar<T> |  |