| 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 | Task Instance Identifier |
| instantiatesCanonical | 0..1 | canonical | Formal definition of task |
| instantiatesUri | 0..1 | uri | Formal definition of task |
| basedOn | 0..* | Reference | Request fulfilled by this task |
| groupIdentifier | 0..1 | Identifier | Requisition or grouper id |
| partOf | 0..* | Reference | Composite task |
| status | 1..1 | code | draft | requested | received | accepted | + |
| statusReason | 0..1 | CodeableConcept | Reason for current status |
| businessStatus | 0..1 | CodeableConcept | E.g. "Specimen collected", "IV prepped" |
| intent | 1..1 | code | unknown | proposal | plan | order | original-order | reflex-order | filler-order | instance-order | option |
| priority | 0..1 | code | routine | urgent | asap | stat |
| code | 0..1 | CodeableConcept | Task Type |
| description | 0..1 | string | Human-readable explanation of task |
| focus | 0..1 | Reference | What task is acting on |
| for | 0..1 | Reference | Beneficiary of the Task |
| encounter | 0..1 | Reference | Healthcare event during which this task originated |
| executionPeriod | 0..1 | Period | Start and end time of execution |
| authoredOn | 0..1 | dateTime | Task Creation Date |
| lastModified | 0..1 | dateTime | Task Last Modified Date |
| requester | 0..1 | Reference | Who is asking for task to be done |
| performerType | 0..* | CodeableConcept | Requested performer |
| owner | 0..1 | Reference | Responsible individual |
| location | 0..1 | Reference | Where task occurs |
| reasonCode | 0..1 | CodeableConcept | Why task is needed |
| reasonReference | 0..1 | Reference | Why task is needed |
| insurance | 0..* | Reference | Associated insurance coverage |
| note | 0..* | Annotation | Comments made about the task |
| relevantHistory | 0..* | Reference | Key events in history of the Task |
| restriction | 0..1 | BackboneElement | Constraints on fulfillment tasks |
| input | 0..* | BackboneElement | Information used to perform task |
| output | 0..* | BackboneElement | Information produced as part of task |