> ## Documentation Index > Fetch the complete documentation index at: https://docs.metriport.com/llms.txt > Use this file to discover all available pages before exploring further. # ActivityDefinition > This resource allows for the definition of some activity to be performed, independent of a particular patient, practitioner, or other performance context. ## Properties | Name | Required | Type | Description | | ---------------------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ | | url | No | uri | Canonical identifier for this activity definition, represented as a URI (globally unique) | | identifier | No | [Identifier](/medical-api/fhir/data-types/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](/medical-api/fhir/data-types/codeableconcept), Reference\<[Group](/medical-api/fhir/resources/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](/medical-api/fhir/data-types/contactdetail)\[] | Contact details for the publisher | | description | No | markdown | Natural language description of the activity definition | | useContext | No | [UsageContext](/medical-api/fhir/data-types/usagecontext)\[] | The context that the content is intended to support | | jurisdiction | No | [CodeableConcept](/medical-api/fhir/data-types/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](/medical-api/fhir/data-types/period) | When the activity definition is expected to be used | | topic | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | E.g. Education, Treatment, Assessment, etc. | | author | No | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[] | Who authored the content | | editor | No | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[] | Who edited the content | | reviewer | No | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[] | Who reviewed the content | | endorser | No | [ContactDetail](/medical-api/fhir/data-types/contactdetail)\[] | Who endorsed the content | | relatedArtifact | No | [RelatedArtifact](/medical-api/fhir/data-types/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](/medical-api/fhir/data-types/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](/medical-api/fhir/data-types/timing), dateTime, [Age](/medical-api/fhir/data-types/age), [Period](/medical-api/fhir/data-types/period), [Range](/medical-api/fhir/data-types/range), [Duration](/medical-api/fhir/data-types/duration) | When activity is to occur | | location | No | Reference\<[Location](/medical-api/fhir/resources/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](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations | | - modifierExtension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored even if unrecognized | | - type | Yes | code | patient / practitioner / related-person / device | | - role | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept) | E.g. Nurse, Surgeon, Parent, etc. | | product\[x] | No | Reference\<[Medication](/medical-api/fhir/resources/medication) / [Substance](/medical-api/fhir/resources/substance)>, [CodeableConcept](/medical-api/fhir/data-types/codeableconcept) | What's administered/supplied | | quantity | No | [Quantity](/medical-api/fhir/data-types/quantity) | How much is administered/consumed/supplied | | dosage | No | [Dosage](/medical-api/fhir/data-types/dosage)\[] | Detailed dosage instructions | | bodySite | No | [CodeableConcept](/medical-api/fhir/data-types/codeableconcept)\[] | What part of body to perform on | | specimenRequirement | No | Reference\<[SpecimenDefinition](/medical-api/fhir/resources/specimendefinition)>\[] | What specimens are required to perform this action | | observationRequirement | No | Reference\<[ObservationDefinition](/medical-api/fhir/resources/observationdefinition)>\[] | What observations are required to perform this action | | observationResultRequirement | No | Reference\<[ObservationDefinition](/medical-api/fhir/resources/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](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations | | - modifierExtension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored even if unrecognized | | - path | Yes | string | The path to the element to be set dynamically | | - expression | Yes | [Expression](/medical-api/fhir/data-types/expression) | An expression that provides the dynamic value for the customization | ## Search Parameters | Name | Type | Description | Expression | | --------------------- | --------- | ----------------------------------------------------------------------------------------- | ----------------------------------- | | composed-of | reference | What resource is being referenced | ActivityDefinition.relatedArtifact | | context | token | A use context assigned to the activity definition | ActivityDefinition.useContext.value | | context-quantity | quantity | A quantity- or range-valued use context assigned to the activity definition | ActivityDefinition.useContext.value | | context-type | token | A type of use context assigned to the activity definition | ActivityDefinition.useContext.code | | date | date | The activity definition publication date | ActivityDefinition.date | | depends-on | reference | What resource is being referenced | ActivityDefinition.relatedArtifact | | derived-from | reference | What resource is being referenced | ActivityDefinition.relatedArtifact | | description | string | The description of the activity definition | ActivityDefinition.description | | effective | date | The time during which the activity definition is intended to be in use | ActivityDefinition.effectivePeriod | | identifier | token | External identifier for the activity definition | ActivityDefinition.identifier | | jurisdiction | token | Intended jurisdiction for the activity definition | ActivityDefinition.jurisdiction | | name | string | Computationally friendly name of the activity definition | ActivityDefinition.name | | predecessor | reference | What resource is being referenced | ActivityDefinition.relatedArtifact | | publisher | string | Name of the publisher of the activity definition | ActivityDefinition.publisher | | status | token | The current status of the activity definition | ActivityDefinition.status | | successor | reference | What resource is being referenced | ActivityDefinition.relatedArtifact | | title | string | The human-friendly name of the activity definition | ActivityDefinition.title | | topic | token | Topics associated with the module | ActivityDefinition.topic | | url | uri | The uri that identifies the activity definition | ActivityDefinition.url | | version | token | The business version of the activity definition | ActivityDefinition.version | | context-type-quantity | composite | A use context type and quantity- or range-based value assigned to the activity definition | ActivityDefinition.useContext | | context-type-value | composite | A use context type and value assigned to the activity definition | ActivityDefinition.useContext | ## Inherited Properties | Name | Required | Type | Description | | ----------------- | -------- | ------------------------------------------------------ | ------------------------------------------------------ | | id | No | string | Logical id of this artifact | | meta | No | [Meta](/medical-api/fhir/data-types/meta) | Metadata about the resource | | implicitRules | No | uri | A set of rules under which this content was created | | language | No | code | Language of the resource content | | text | No | [Narrative](/medical-api/fhir/data-types/narrative) | Text summary of the resource, for human interpretation | | contained | No | Resource\[] | Contained, inline Resources | | extension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Additional content defined by implementations | | modifierExtension | No | [Extension](/medical-api/fhir/data-types/extension)\[] | Extensions that cannot be ignored | To view the FHIR specification for this resource, see [ActivityDefinition](https://www.hl7.org/fhir/StructureDefinition/ActivityDefinition).