| Type | Location | Extends | Description |
|---|---|---|---|
| element_type | ciaaw__types | None | Derived type representing an element. |
| ice_type | ciaaw__types | None | Derived type reprensenting the isotopic abundance. |
| naw_type | ciaaw__types | None | Derived type reprensenting the nuclide’s atomic weights. |
| saw_type | ciaaw__types | None | Derived type representing the standard atomic weight of an element. |