| 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[] | Contact details for the publisher |
| description | No | markdown | Natural language description of the graph definition |
| useContext | No | UsageContext[] | The context that the content is intended to support |
| jurisdiction | No | 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[] | Additional content defined by implementations |
| - modifierExtension | No | 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[] | Additional content defined by implementations |
| - modifierExtension | No | 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[] | Additional content defined by implementations |
| - modifierExtension | No | 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 |
