| PredefinedDataTypes are contained by value, ie the column owns an instance of the data type. A Column must have one of, but not both, a containedType or a referencedType. | |
| Setting the containedType on a column will remove any referencedType, and vice versa. | |
| It is recommended to not set the containedType or referencedType explicitly. These relationships are managed by the column. To set the type for a column, simply call setType(DataType newType) on a Column. |