> ## 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. # GraphDefinition > A formal computable definition of a graph of resources - that is, a coherent set of resources that form a graph by following references. The Graph Definition resource defines a set and makes rules about the set. ## Properties | Name | Required | Type | Description | | ------------------- | -------- | ------------------------------------------------------------------ | -------------------------------------------------------------------------------------- | | url | No | uri | Canonical identifier for this graph definition, represented as a URI (globally unique) | | version | No | string | Business version of the graph definition | | name | Yes | string | Name for this graph definition (computer friendly) | | status | Yes | code | draft / active / retired / unknown | | experimental | No | boolean | For testing purposes, not real usage | | 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 graph 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 graph definition (if applicable) | | purpose | No | markdown | Why this graph definition is defined | | start | Yes | code | Type of resource at which the graph starts | | profile | No | canonical | Profile on base resource | | link | No | GraphDefinitionLink | Links this graph makes rules about | | - 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 | No | string | Path in the resource that contains the link | | - sliceName | No | string | Which slice (if profiled) | | - min | No | integer | Minimum occurrences for this link | | - max | No | string | Maximum occurrences for this link | | - description | No | string | Why this link is specified | | - target | No | GraphDefinitionLinkTarget | Potential target for the link | | - 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 | Type of resource this link refers to | | - params | No | string | Criteria for reverse lookup | | - profile | No | canonical | Profile for the target resource | | - compartment | No | GraphDefinitionLinkTargetCompartment | Compartment Consistency Rules | | - 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 | | - use | Yes | code | condition / requirement | | - code | Yes | code | Patient / Encounter / RelatedPerson / Practitioner / Device | | - rule | Yes | code | identical / matching / different / custom | | - expression | No | string | Custom rule, as a FHIRPath expression | | - description | No | string | Documentation for FHIRPath expression | | - link | No | \[] | Additional links from target resource | ## Search Parameters | Name | Type | Description | Expression | | --------------------- | --------- | -------------------------------------------------------------------------------------- | -------------------------------- | | context | token | A use context assigned to the graph definition | GraphDefinition.useContext.value | | context-quantity | quantity | A quantity- or range-valued use context assigned to the graph definition | GraphDefinition.useContext.value | | context-type | token | A type of use context assigned to the graph definition | GraphDefinition.useContext.code | | date | date | The graph definition publication date | GraphDefinition.date | | description | string | The description of the graph definition | GraphDefinition.description | | jurisdiction | token | Intended jurisdiction for the graph definition | GraphDefinition.jurisdiction | | name | string | Computationally friendly name of the graph definition | GraphDefinition.name | | publisher | string | Name of the publisher of the graph definition | GraphDefinition.publisher | | status | token | The current status of the graph definition | GraphDefinition.status | | url | uri | The uri that identifies the graph definition | GraphDefinition.url | | version | token | The business version of the graph definition | GraphDefinition.version | | context-type-quantity | composite | A use context type and quantity- or range-based value assigned to the graph definition | GraphDefinition.useContext | | context-type-value | composite | A use context type and value assigned to the graph definition | GraphDefinition.useContext | | start | token | Type of resource at which the graph starts | GraphDefinition.start | ## 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 [GraphDefinition](https://www.hl7.org/fhir/StructureDefinition/GraphDefinition).