| id | 0..1 | string | Logical id of this artifact |
| meta | 0..1 | Meta | Metadata about the resource |
| implicitRules | 0..1 | uri | A set of rules under which this content was created |
| language | 0..1 | code | Language of the resource content |
| text | 0..1 | Narrative | Text summary of the resource, for human interpretation |
| contained | 0..* | Resource | Contained, inline Resources |
| extension | 0..* | Extension | Additional content defined by implementations |
| modifierExtension | 0..* | Extension | Extensions that cannot be ignored |
| identifier | 0..* | Identifier | Business identifier |
| status | 1..1 | code | active | inactive | entered-in-error |
| category | 0..* | CodeableConcept | Clinical, administrative, etc. |
| code | 1..1 | CodeableConcept | Coded or textual message to display to user |
| subject | 1..1 | Reference | Who/What is flag about? |
| period | 0..1 | Period | Time period when flag is active |
| encounter | 0..1 | Reference | Alert relevant during encounter |
| author | 0..1 | Reference | Flag creator |