| Code | Display | Definition |
| code | code (internal reference) | The property value is a code that identifies a concept defined in the code system. |
| Coding | Coding (external reference) | The property value is a code defined in an external code system. This may be used for translations, but is not the intent. |
| string | string | The property value is a string. |
| integer | integer | The property value is an integer (often used to assign ranking values to concepts for supporting score assessments). |
| boolean | boolean | The property value is a boolean true | false. |
| dateTime | dateTime | The property is a date or a date + time. |
| decimal | decimal | The property value is a decimal number. |