| url | No | uri | Canonical identifier for this activity definition, represented as a URI (globally unique) |
| identifier | No | Identifier[] | Additional identifier for the activity definition |
| version | No | string | Business version of the activity definition |
| name | No | string | Name for this activity definition (computer friendly) |
| title | No | string | Name for this activity definition (human friendly) |
| subtitle | No | string | Subordinate title of the activity definition |
| status | Yes | code | draft / active / retired / unknown |
| experimental | No | boolean | For testing purposes, not real usage |
| subject[x] | No | CodeableConcept, Reference<Group> | Type of individual the activity definition is intended for |
| date | No | dateTime | Date last changed |
| publisher | No | string | Name of the publisher (organization or individual) |
| contact | No | ContactDetail[] | Contact details for the publisher |
| description | No | markdown | Natural language description of the activity definition |
| useContext | No | UsageContext[] | The context that the content is intended to support |
| jurisdiction | No | CodeableConcept[] | Intended jurisdiction for activity definition (if applicable) |
| purpose | No | markdown | Why this activity definition is defined |
| usage | No | string | Describes the clinical usage of the activity definition |
| copyright | No | markdown | Use and/or publishing restrictions |
| approvalDate | No | date | When the activity definition was approved by publisher |
| lastReviewDate | No | date | When the activity definition was last reviewed |
| effectivePeriod | No | Period | When the activity definition is expected to be used |
| topic | No | CodeableConcept[] | E.g. Education, Treatment, Assessment, etc. |
| author | No | ContactDetail[] | Who authored the content |
| editor | No | ContactDetail[] | Who edited the content |
| reviewer | No | ContactDetail[] | Who reviewed the content |
| endorser | No | ContactDetail[] | Who endorsed the content |
| relatedArtifact | No | RelatedArtifact[] | Additional documentation, citations, etc. |
| library | No | canonical[] | Logic used by the activity definition |
| kind | No | code | Kind of resource |
| profile | No | canonical | What profile the resource needs to conform to |
| code | No | CodeableConcept | Detail type of activity |
| intent | No | code | proposal / plan / directive / order / original-order / reflex-order / filler-order / instance-order / option |
| priority | No | code | routine / urgent / asap / stat |
| doNotPerform | No | boolean | True if the activity should not be performed |
| timing[x] | No | Timing, dateTime, Age, Period, Range, Duration | When activity is to occur |
| location | No | Reference<Location> | Where it should happen |
| participant | No | ActivityDefinitionParticipant | Who should participate in the action |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - type | Yes | code | patient / practitioner / related-person / device |
| - role | No | CodeableConcept | E.g. Nurse, Surgeon, Parent, etc. |
| product[x] | No | Reference<Medication / Substance>, CodeableConcept | What’s administered/supplied |
| quantity | No | Quantity | How much is administered/consumed/supplied |
| dosage | No | Dosage[] | Detailed dosage instructions |
| bodySite | No | CodeableConcept[] | What part of body to perform on |
| specimenRequirement | No | Reference<SpecimenDefinition>[] | What specimens are required to perform this action |
| observationRequirement | No | Reference<ObservationDefinition>[] | What observations are required to perform this action |
| observationResultRequirement | No | Reference<ObservationDefinition>[] | What observations must be produced by this action |
| transform | No | canonical | Transform to apply the template |
| dynamicValue | No | ActivityDefinitionDynamicValue | Dynamic aspects of the definition |
| - id | No | string | Unique id for inter-element referencing |
| - extension | No | Extension[] | Additional content defined by implementations |
| - modifierExtension | No | Extension[] | Extensions that cannot be ignored even if unrecognized |
| - path | Yes | string | The path to the element to be set dynamically |
| - expression | Yes | Expression | An expression that provides the dynamic value for the customization |
