8 Standard DataTypes 
8.49 StructureType
This DataType is an enumeration that specifies type of Structure defined by a StructureDefinition. Its values are defined in Table 33.
Table 33 – StructureType Values
| Name | Value | Description |
|---|---|---|
| Structure | 0 | A Structure without optional fields where none of the fields allow subtyping |
| StructureWithOptionalFields | 1 | A Structure with optional fields where none of the fields allow subtyping |
| Union | 2 | A Union DataType where none of the fields allow subtyping |
| StructureWithSubtypedValues | 3 | A Structure without optional fields where one or more of the fields allow subtyping |
| UnionWithSubtypedValues | 4 | A Union DataType where one or more of the fields allow subtyping |