Release 5 Ballot

This page is part of the FHIR Specification (v5.0.0-ballot: R5 Ballot - see ballot notes). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R5 R4B R4 R3

5.9 Resource GraphDefinition - Content

FHIR Infrastructure icon Work GroupMaturity Level: 1 Trial UseSecurity Category: Anonymous Compartments: Not linked to any defined compartments

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.

The GraphDefinition resource provides 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. The GraphDefinition resource can be used to:

  • Summarize a set of profiles on resources
  • Define a graph of resources to return in a query
  • Define a graph of resources to include in a document
  • Document rules about the relationship between a set of resources e.g. must all resources concern the same patient?

There is a close relationship between Profiles and GraphDefinitions:

  • A StructureDefinition defines a profile, and profiles can make rules about the relationships between resources. A carefully defined set of profiles implies part of what is in a GraphDefinition
  • A GraphDefinition defines rules about the relationships between resources, and in so doing, implies some constraints that would need to be represented in their profiles
  • Like CompartmentDefinition, GraphDefinition allows defining a grouping of resources and may be used for security access permissions. However, GraphDefinitions do not define additional query capabilities and is much more limited in how membership in the collection is defined (all resources that are part of a Compartment must expose a search parameter of the same name).

Profiles and Graph Definitions can be used together, or separately. When used together, they should be consistent. Note, though, that a graph definition may contain a subset or a superset of the relationships explicitly described in the profiles it refers to.

It is possible that in some circumstances, a graph definition makes incompatible rules with the Profiles it refers to - in this case, no graph if resources will meet the constraints expressed. Applications should - but are not required - detect when such incompatibilities arise.

Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. GraphDefinition TUDomainResourceDefinition of a graph of resources
+ Warning: Name should be usable as an identifier for the module by machine processing applications such as code generation

Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension
Interfaces Implemented: CanonicalResource
... url ΣC0..1uriCanonical identifier for this graph definition, represented as a URI (globally unique)
+ Warning: URL should not contain | or # - these characters make processing canonical references problematic
... version Σ0..1stringBusiness version of the graph definition
... versionAlgorithm[x] Σ0..1How to compare versions
Version Algorithm (Extensible)
.... versionAlgorithmStringstring
.... versionAlgorithmCodingCoding
... title Σ0..1stringName for this graph definition (human friendly)
... status ?!Σ1..1codedraft | active | retired | unknown
PublicationStatus (Required)
... experimental Σ0..1booleanFor testing purposes, not real usage
... date Σ0..1dateTimeDate last changed
... publisher Σ0..1stringName of the publisher/steward (organization or individual)
... contact Σ0..*ContactDetailContact details for the publisher

... description 0..1markdownNatural language description of the graph definition
... useContext Σ0..*UsageContextThe context that the content is intended to support

... jurisdiction Σ0..*CodeableConceptIntended jurisdiction for graph definition (if applicable)
Jurisdiction (Extensible)

... purpose 0..1markdownWhy this graph definition is defined
... start Σ1..1codeType of resource at which the graph starts
Resource Types (Required)
... profile 0..1canonical(StructureDefinition)Profile on base resource
... link 0..*BackboneElementLinks this graph makes rules about

.... path 0..1stringPath in the resource that contains the link
.... sliceName 0..1stringWhich slice (if profiled)
.... min 0..1integerMinimum occurrences for this link
.... max 0..1stringMaximum occurrences for this link
.... description 0..1stringWhy this link is specified
.... target 0..*BackboneElementPotential target for the link

..... type 1..1codeType of resource this link refers to
All Resource Types (Required)
..... params 0..1stringCriteria for reverse lookup
..... profile 0..1canonical(StructureDefinition)Profile for the target resource
..... compartment 0..*BackboneElementCompartment Consistency Rules

...... use 1..1codecondition | requirement
GraphCompartmentUse (Required)
...... code 1..1codePatient | Encounter | RelatedPerson | Practitioner | Device
CompartmentType (Required)
...... rule 1..1codeidentical | matching | different | custom
GraphCompartmentRule (Required)
...... expression 0..1stringCustom rule, as a FHIRPath expression
...... description 0..1stringDocumentation for FHIRPath expression
..... link 0..*see linkAdditional links from target resource


doco Documentation for this format

See the Extensions for this resource

UML Diagram (Legend)

GraphDefinition (DomainResource) +CanonicalResourceAn absolute URI that is used to identify this graph definition when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which an authoritative instance of this graph definition is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the graph definition is stored on different serversurl : uri [0..1]The identifier that is used to identify this version of the graph definition when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the graph definition author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequenceversion : string [0..1]Indicates the mechanism used to compare versions to determine which is more currentversionAlgorithm[x] : DataType [0..1] « string|Coding; null (Strength=Extensible) VersionAlgorithm+ »A natural language name identifying the graph definition. This name should be usable as an identifier for the module by machine processing applications such as code generationname : string [1..1] « This element has or is affected by some invariantsC »A short, descriptive, user-friendly title for the capability statementtitle : string [0..1]The status of this graph definition. Enables tracking the life-cycle of the content (this element modifies the meaning of other elements)status : code [1..1] « null (Strength=Required)PublicationStatus! »A Boolean value to indicate that this graph definition is authored for testing purposes (or education/evaluation/marketing) and is not intended to be used for genuine usageexperimental : boolean [0..1]The date (and optionally time) when the graph definition was published. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the graph definition changesdate : dateTime [0..1]The name of the organization or individual responsible for the release and ongoing maintenance of the graph definitionpublisher : string [0..1]Contact details to assist a user in finding and communicating with the publishercontact : ContactDetail [0..*]A free text natural language description of the graph definition from a consumer's perspectivedescription : markdown [0..1]The content was developed with a focus and intent of supporting the contexts that are listed. These contexts may be general categories (gender, age, ...) or may be references to specific programs (insurance plans, studies, ...) and may be used to assist with indexing and searching for appropriate graph definition instancesuseContext : UsageContext [0..*]A legal or geographic region in which the graph definition is intended to be usedjurisdiction : CodeableConcept [0..*] « null (Strength=Extensible)Jurisdiction ValueSet+ »Explanation of why this graph definition is needed and why it has been designed as it haspurpose : markdown [0..1]The type of FHIR resource at which instances of this graph startstart : code [1..1] « null (Strength=Required)ResourceType! »The profile that describes the use of the base resourceprofile : canonical [0..1] « StructureDefinition »LinkA FHIRPath expression that identifies one of FHIR References to other resourcespath : string [0..1]Which slice (if profiled)sliceName : string [0..1]Minimum occurrences for this linkmin : integer [0..1]Maximum occurrences for this linkmax : string [0..1]Information about why this link is of interest in this graph definitiondescription : string [0..1]TargetType of resource this link refers totype : code [1..1] « null (Strength=Required)AllResourceTypes! »A set of parameters to look upparams : string [0..1]Profile for the target resourceprofile : canonical [0..1] « StructureDefinition »CompartmentDefines how the compartment rule is used - whether it it is used to test whether resources are subject to the rule, or whether it is a rule that must be followeduse : code [1..1] « null (Strength=Required)GraphCompartmentUse! »Identifies the compartmentcode : code [1..1] « null (Strength=Required)CompartmentType! »identical | matching | different | no-rule | customrule : code [1..1] « null (Strength=Required)GraphCompartmentRule! »Custom rule, as a FHIRPath expressionexpression : string [0..1]Documentation for FHIRPath expressiondescription : string [0..1]Compartment Consistency Rulescompartment[0..*]Additional links from target resourcelink[0..*]Potential target for the linktarget[0..*]Links this graph makes rules aboutlink[0..*]

XML Template

<GraphDefinition xmlns="http://hl7.org/fhir"> doco
 <!-- from Resource: id, meta, implicitRules, and language -->
 <!-- from DomainResource: text, contained, extension, and modifierExtension -->
 <url value="[uri]"/><!-- 0..1 Canonical identifier for this graph definition, represented as a URI (globally unique) -->
 <version value="[string]"/><!-- 0..1 Business version of the graph definition -->
 <versionAlgorithm[x]><!-- 0..1 string|Coding How to compare versions --></versionAlgorithm[x]>
 <name value="[string]"/><!-- I 1..1 Name for this graph definition (computer friendly) -->
 <title value="[string]"/><!-- 0..1 Name for this graph definition (human friendly) -->
 <status value="[code]"/><!-- 1..1 draft | active | retired | unknown -->
 <experimental value="[boolean]"/><!-- 0..1 For testing purposes, not real usage -->
 <date value="[dateTime]"/><!-- 0..1 Date last changed -->
 <publisher value="[string]"/><!-- 0..1 Name of the publisher/steward (organization or individual) -->
 <contact><!-- 0..* ContactDetail Contact details for the publisher --></contact>
 <description value="[markdown]"/><!-- 0..1 Natural language description of the graph definition -->
 <useContext><!-- 0..* UsageContext The context that the content is intended to support --></useContext>
 <jurisdiction><!-- 0..* CodeableConcept Intended jurisdiction for graph definition (if applicable) --></jurisdiction>
 <purpose value="[markdown]"/><!-- 0..1 Why this graph definition is defined -->
 <start value="[code]"/><!-- 1..1 Type of resource at which the graph starts -->
 <profile><!-- 0..1 canonical(StructureDefinition) Profile on base resource --></profile>
 <link>  <!-- 0..* Links this graph makes rules about -->
  <path value="[string]"/><!-- 0..1 Path in the resource that contains the link -->
  <sliceName value="[string]"/><!-- 0..1 Which slice (if profiled) -->
  <min value="[integer]"/><!-- 0..1 Minimum occurrences for this link -->
  <max value="[string]"/><!-- 0..1 Maximum occurrences for this link -->
  <description value="[string]"/><!-- 0..1 Why this link is specified -->
  <target>  <!-- 0..* Potential target for the link -->
   <type value="[code]"/><!-- 1..1 Type of resource this link refers to -->
   <params value="[string]"/><!-- 0..1 Criteria for reverse lookup -->
   <profile><!-- 0..1 canonical(StructureDefinition) Profile for the target resource --></profile>
   <compartment>  <!-- 0..* Compartment Consistency Rules -->
    <use value="[code]"/><!-- 1..1 condition | requirement -->
    <code value="[code]"/><!-- 1..1 Patient | Encounter | RelatedPerson | Practitioner | Device -->
    <rule value="[code]"/><!-- 1..1 identical | matching | different | custom -->
    <expression value="[string]"/><!-- 0..1 Custom rule, as a FHIRPath expression -->
    <description value="[string]"/><!-- 0..1 Documentation for FHIRPath expression -->
   </compartment>
   <link><!-- 0..* Content as for GraphDefinition.link Additional links from target resource --></link>
  </target>
 </link>
</GraphDefinition>

JSON Template

{doco
  "resourceType" : "GraphDefinition",
  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "url" : "<uri>", // Canonical identifier for this graph definition, represented as a URI (globally unique)
  "version" : "<string>", // Business version of the graph definition
  // versionAlgorithm[x]: How to compare versions. One of these 2:
  "versionAlgorithmString" : "<string>",
  "versionAlgorithmCoding" : { Coding },
  "name" : "<string>", // I R!  Name for this graph definition (computer friendly)
  "title" : "<string>", // Name for this graph definition (human friendly)
  "status" : "<code>", // R!  draft | active | retired | unknown
  "experimental" : <boolean>, // For testing purposes, not real usage
  "date" : "<dateTime>", // Date last changed
  "publisher" : "<string>", // Name of the publisher/steward (organization or individual)
  "contact" : [{ ContactDetail }], // Contact details for the publisher
  "description" : "<markdown>", // Natural language description of the graph definition
  "useContext" : [{ UsageContext }], // The context that the content is intended to support
  "jurisdiction" : [{ CodeableConcept }], // Intended jurisdiction for graph definition (if applicable)
  "purpose" : "<markdown>", // Why this graph definition is defined
  "start" : "<code>", // R!  Type of resource at which the graph starts
  "profile" : "<canonical(StructureDefinition)>", // Profile on base resource
  "link" : [{ // Links this graph makes rules about
    "path" : "<string>", // Path in the resource that contains the link
    "sliceName" : "<string>", // Which slice (if profiled)
    "min" : <integer>, // Minimum occurrences for this link
    "max" : "<string>", // Maximum occurrences for this link
    "description" : "<string>", // Why this link is specified
    "target" : [{ // Potential target for the link
      "type" : "<code>", // R!  Type of resource this link refers to
      "params" : "<string>", // Criteria for reverse lookup
      "profile" : "<canonical(StructureDefinition)>", // Profile for the target resource
      "compartment" : [{ // Compartment Consistency Rules
        "use" : "<code>", // R!  condition | requirement
        "code" : "<code>", // R!  Patient | Encounter | RelatedPerson | Practitioner | Device
        "rule" : "<code>", // R!  identical | matching | different | custom
        "expression" : "<string>", // Custom rule, as a FHIRPath expression
        "description" : "<string>" // Documentation for FHIRPath expression
      }],
      "link" : [{ Content as for GraphDefinition.link }] // Additional links from target resource
    }]
  }]
}

Turtle Template

@prefix fhir: <http://hl7.org/fhir/> .doco


[ a fhir:GraphDefinition;
  fhir:nodeRole fhir:treeRoot; # if this is the parser root

  # from Resource: .id, .meta, .implicitRules, and .language
  # from DomainResource: .text, .contained, .extension, and .modifierExtension
  fhir:GraphDefinition.url [ uri ]; # 0..1 Canonical identifier for this graph definition, represented as a URI (globally unique)
  fhir:GraphDefinition.version [ string ]; # 0..1 Business version of the graph definition
  # GraphDefinition.versionAlgorithm[x] : 0..1 How to compare versions. One of these 2
    fhir:GraphDefinition.versionAlgorithmString [ string ]
    fhir:GraphDefinition.versionAlgorithmCoding [ Coding ]
  fhir:GraphDefinition.name [ string ]; # 1..1 I Name for this graph definition (computer friendly)
  fhir:GraphDefinition.title [ string ]; # 0..1 Name for this graph definition (human friendly)
  fhir:GraphDefinition.status [ code ]; # 1..1 draft | active | retired | unknown
  fhir:GraphDefinition.experimental [ boolean ]; # 0..1 For testing purposes, not real usage
  fhir:GraphDefinition.date [ dateTime ]; # 0..1 Date last changed
  fhir:GraphDefinition.publisher [ string ]; # 0..1 Name of the publisher/steward (organization or individual)
  fhir:GraphDefinition.contact [ ContactDetail ], ... ; # 0..* Contact details for the publisher
  fhir:GraphDefinition.description [ markdown ]; # 0..1 Natural language description of the graph definition
  fhir:GraphDefinition.useContext [ UsageContext ], ... ; # 0..* The context that the content is intended to support
  fhir:GraphDefinition.jurisdiction [ CodeableConcept ], ... ; # 0..* Intended jurisdiction for graph definition (if applicable)
  fhir:GraphDefinition.purpose [ markdown ]; # 0..1 Why this graph definition is defined
  fhir:GraphDefinition.start [ code ]; # 1..1 Type of resource at which the graph starts
  fhir:GraphDefinition.profile [ canonical(StructureDefinition) ]; # 0..1 Profile on base resource
  fhir:GraphDefinition.link [ # 0..* Links this graph makes rules about
    fhir:GraphDefinition.link.path [ string ]; # 0..1 Path in the resource that contains the link
    fhir:GraphDefinition.link.sliceName [ string ]; # 0..1 Which slice (if profiled)
    fhir:GraphDefinition.link.min [ integer ]; # 0..1 Minimum occurrences for this link
    fhir:GraphDefinition.link.max [ string ]; # 0..1 Maximum occurrences for this link
    fhir:GraphDefinition.link.description [ string ]; # 0..1 Why this link is specified
    fhir:GraphDefinition.link.target [ # 0..* Potential target for the link
      fhir:GraphDefinition.link.target.type [ code ]; # 1..1 Type of resource this link refers to
      fhir:GraphDefinition.link.target.params [ string ]; # 0..1 Criteria for reverse lookup
      fhir:GraphDefinition.link.target.profile [ canonical(StructureDefinition) ]; # 0..1 Profile for the target resource
      fhir:GraphDefinition.link.target.compartment [ # 0..* Compartment Consistency Rules
        fhir:GraphDefinition.link.target.compartment.use [ code ]; # 1..1 condition | requirement
        fhir:GraphDefinition.link.target.compartment.code [ code ]; # 1..1 Patient | Encounter | RelatedPerson | Practitioner | Device
        fhir:GraphDefinition.link.target.compartment.rule [ code ]; # 1..1 identical | matching | different | custom
        fhir:GraphDefinition.link.target.compartment.expression [ string ]; # 0..1 Custom rule, as a FHIRPath expression
        fhir:GraphDefinition.link.target.compartment.description [ string ]; # 0..1 Documentation for FHIRPath expression
      ], ...;
      fhir:GraphDefinition.link.target.link [ See GraphDefinition.link ], ... ; # 0..* Additional links from target resource
    ], ...;
  ], ...;
]

Changes since R4

GraphDefinition
GraphDefinition.versionAlgorithm[x]
  • Added Element
GraphDefinition.title
  • Added Element
GraphDefinition.link.target.type
  • Change value set from http://hl7.org/fhir/ValueSet/resource-types|4.0.0 to http://hl7.org/fhir/ValueSet/all-resource-types|5.0.0-ballot
  • Change value set from http://hl7.org/fhir/ValueSet/resource-types|4.0.0 to http://hl7.org/fhir/ValueSet/all-resource-types|5.0.0-ballot

See the Full Difference for further information

This analysis is available as XML or JSON.

See R3 <--> R4 Conversion Maps (status = 1 test that all execute ok. All tests pass round-trip testing and 1 r3 resources are invalid (0 errors).)

Structure

NameFlagsCard.TypeDescription & Constraintsdoco
.. GraphDefinition TUDomainResourceDefinition of a graph of resources
+ Warning: Name should be usable as an identifier for the module by machine processing applications such as code generation

Elements defined in Ancestors: id, meta, implicitRules, language, text, contained, extension, modifierExtension
Interfaces Implemented: CanonicalResource
... url ΣC0..1uriCanonical identifier for this graph definition, represented as a URI (globally unique)
+ Warning: URL should not contain | or # - these characters make processing canonical references problematic
... version Σ0..1stringBusiness version of the graph definition
... versionAlgorithm[x] Σ0..1How to compare versions
Version Algorithm (Extensible)
.... versionAlgorithmStringstring
.... versionAlgorithmCodingCoding
... title Σ0..1stringName for this graph definition (human friendly)
... status ?!Σ1..1codedraft | active | retired | unknown
PublicationStatus (Required)
... experimental Σ0..1booleanFor testing purposes, not real usage
... date Σ0..1dateTimeDate last changed
... publisher Σ0..1stringName of the publisher/steward (organization or individual)
... contact Σ0..*ContactDetailContact details for the publisher

... description 0..1markdownNatural language description of the graph definition
... useContext Σ0..*UsageContextThe context that the content is intended to support

... jurisdiction Σ0..*CodeableConceptIntended jurisdiction for graph definition (if applicable)
Jurisdiction (Extensible)

... purpose 0..1markdownWhy this graph definition is defined
... start Σ1..1codeType of resource at which the graph starts
Resource Types (Required)
... profile 0..1canonical(StructureDefinition)Profile on base resource
... link 0..*BackboneElementLinks this graph makes rules about

.... path 0..1stringPath in the resource that contains the link
.... sliceName 0..1stringWhich slice (if profiled)
.... min 0..1integerMinimum occurrences for this link
.... max 0..1stringMaximum occurrences for this link
.... description 0..1stringWhy this link is specified
.... target 0..*BackboneElementPotential target for the link

..... type 1..1codeType of resource this link refers to
All Resource Types (Required)
..... params 0..1stringCriteria for reverse lookup
..... profile 0..1canonical(StructureDefinition)Profile for the target resource
..... compartment 0..*BackboneElementCompartment Consistency Rules

...... use 1..1codecondition | requirement
GraphCompartmentUse (Required)
...... code 1..1codePatient | Encounter | RelatedPerson | Practitioner | Device
CompartmentType (Required)
...... rule 1..1codeidentical | matching | different | custom
GraphCompartmentRule (Required)
...... expression 0..1stringCustom rule, as a FHIRPath expression
...... description 0..1stringDocumentation for FHIRPath expression
..... link 0..*see linkAdditional links from target resource


doco Documentation for this format

See the Extensions for this resource

UML Diagram (Legend)

GraphDefinition (DomainResource) +CanonicalResourceAn absolute URI that is used to identify this graph definition when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which an authoritative instance of this graph definition is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the graph definition is stored on different serversurl : uri [0..1]The identifier that is used to identify this version of the graph definition when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the graph definition author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequenceversion : string [0..1]Indicates the mechanism used to compare versions to determine which is more currentversionAlgorithm[x] : DataType [0..1] « string|Coding; null (Strength=Extensible) VersionAlgorithm+ »A natural language name identifying the graph definition. This name should be usable as an identifier for the module by machine processing applications such as code generationname : string [1..1] « This element has or is affected by some invariantsC »A short, descriptive, user-friendly title for the capability statementtitle : string [0..1]The status of this graph definition. Enables tracking the life-cycle of the content (this element modifies the meaning of other elements)status : code [1..1] « null (Strength=Required)PublicationStatus! »A Boolean value to indicate that this graph definition is authored for testing purposes (or education/evaluation/marketing) and is not intended to be used for genuine usageexperimental : boolean [0..1]The date (and optionally time) when the graph definition was published. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the graph definition changesdate : dateTime [0..1]The name of the organization or individual responsible for the release and ongoing maintenance of the graph definitionpublisher : string [0..1]Contact details to assist a user in finding and communicating with the publishercontact : ContactDetail [0..*]A free text natural language description of the graph definition from a consumer's perspectivedescription : markdown [0..1]The content was developed with a focus and intent of supporting the contexts that are listed. These contexts may be general categories (gender, age, ...) or may be references to specific programs (insurance plans, studies, ...) and may be used to assist with indexing and searching for appropriate graph definition instancesuseContext : UsageContext [0..*]A legal or geographic region in which the graph definition is intended to be usedjurisdiction : CodeableConcept [0..*] « null (Strength=Extensible)Jurisdiction ValueSet+ »Explanation of why this graph definition is needed and why it has been designed as it haspurpose : markdown [0..1]The type of FHIR resource at which instances of this graph startstart : code [1..1] « null (Strength=Required)ResourceType! »The profile that describes the use of the base resourceprofile : canonical [0..1] « StructureDefinition »LinkA FHIRPath expression that identifies one of FHIR References to other resourcespath : string [0..1]Which slice (if profiled)sliceName : string [0..1]Minimum occurrences for this linkmin : integer [0..1]Maximum occurrences for this linkmax : string [0..1]Information about why this link is of interest in this graph definitiondescription : string [0..1]TargetType of resource this link refers totype : code [1..1] « null (Strength=Required)AllResourceTypes! »A set of parameters to look upparams : string [0..1]Profile for the target resourceprofile : canonical [0..1] « StructureDefinition »CompartmentDefines how the compartment rule is used - whether it it is used to test whether resources are subject to the rule, or whether it is a rule that must be followeduse : code [1..1] « null (Strength=Required)GraphCompartmentUse! »Identifies the compartmentcode : code [1..1] « null (Strength=Required)CompartmentType! »identical | matching | different | no-rule | customrule : code [1..1] « null (Strength=Required)GraphCompartmentRule! »Custom rule, as a FHIRPath expressionexpression : string [0..1]Documentation for FHIRPath expressiondescription : string [0..1]Compartment Consistency Rulescompartment[0..*]Additional links from target resourcelink[0..*]Potential target for the linktarget[0..*]Links this graph makes rules aboutlink[0..*]

XML Template

<GraphDefinition xmlns="http://hl7.org/fhir"> doco
 <!-- from Resource: id, meta, implicitRules, and language -->
 <!-- from DomainResource: text, contained, extension, and modifierExtension -->
 <url value="[uri]"/><!-- 0..1 Canonical identifier for this graph definition, represented as a URI (globally unique) -->
 <version value="[string]"/><!-- 0..1 Business version of the graph definition -->
 <versionAlgorithm[x]><!-- 0..1 string|Coding How to compare versions --></versionAlgorithm[x]>
 <name value="[string]"/><!-- I 1..1 Name for this graph definition (computer friendly) -->
 <title value="[string]"/><!-- 0..1 Name for this graph definition (human friendly) -->
 <status value="[code]"/><!-- 1..1 draft | active | retired | unknown -->
 <experimental value="[boolean]"/><!-- 0..1 For testing purposes, not real usage -->
 <date value="[dateTime]"/><!-- 0..1 Date last changed -->
 <publisher value="[string]"/><!-- 0..1 Name of the publisher/steward (organization or individual) -->
 <contact><!-- 0..* ContactDetail Contact details for the publisher --></contact>
 <description value="[markdown]"/><!-- 0..1 Natural language description of the graph definition -->
 <useContext><!-- 0..* UsageContext The context that the content is intended to support --></useContext>
 <jurisdiction><!-- 0..* CodeableConcept Intended jurisdiction for graph definition (if applicable) --></jurisdiction>
 <purpose value="[markdown]"/><!-- 0..1 Why this graph definition is defined -->
 <start value="[code]"/><!-- 1..1 Type of resource at which the graph starts -->
 <profile><!-- 0..1 canonical(StructureDefinition) Profile on base resource --></profile>
 <link>  <!-- 0..* Links this graph makes rules about -->
  <path value="[string]"/><!-- 0..1 Path in the resource that contains the link -->
  <sliceName value="[string]"/><!-- 0..1 Which slice (if profiled) -->
  <min value="[integer]"/><!-- 0..1 Minimum occurrences for this link -->
  <max value="[string]"/><!-- 0..1 Maximum occurrences for this link -->
  <description value="[string]"/><!-- 0..1 Why this link is specified -->
  <target>  <!-- 0..* Potential target for the link -->
   <type value="[code]"/><!-- 1..1 Type of resource this link refers to -->
   <params value="[string]"/><!-- 0..1 Criteria for reverse lookup -->
   <profile><!-- 0..1 canonical(StructureDefinition) Profile for the target resource --></profile>
   <compartment>  <!-- 0..* Compartment Consistency Rules -->
    <use value="[code]"/><!-- 1..1 condition | requirement -->
    <code value="[code]"/><!-- 1..1 Patient | Encounter | RelatedPerson | Practitioner | Device -->
    <rule value="[code]"/><!-- 1..1 identical | matching | different | custom -->
    <expression value="[string]"/><!-- 0..1 Custom rule, as a FHIRPath expression -->
    <description value="[string]"/><!-- 0..1 Documentation for FHIRPath expression -->
   </compartment>
   <link><!-- 0..* Content as for GraphDefinition.link Additional links from target resource --></link>
  </target>
 </link>
</GraphDefinition>

JSON Template

{doco
  "resourceType" : "GraphDefinition",
  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "url" : "<uri>", // Canonical identifier for this graph definition, represented as a URI (globally unique)
  "version" : "<string>", // Business version of the graph definition
  // versionAlgorithm[x]: How to compare versions. One of these 2:
  "versionAlgorithmString" : "<string>",
  "versionAlgorithmCoding" : { Coding },
  "name" : "<string>", // I R!  Name for this graph definition (computer friendly)
  "title" : "<string>", // Name for this graph definition (human friendly)
  "status" : "<code>", // R!  draft | active | retired | unknown
  "experimental" : <boolean>, // For testing purposes, not real usage
  "date" : "<dateTime>", // Date last changed
  "publisher" : "<string>", // Name of the publisher/steward (organization or individual)
  "contact" : [{ ContactDetail }], // Contact details for the publisher
  "description" : "<markdown>", // Natural language description of the graph definition
  "useContext" : [{ UsageContext }], // The context that the content is intended to support
  "jurisdiction" : [{ CodeableConcept }], // Intended jurisdiction for graph definition (if applicable)
  "purpose" : "<markdown>", // Why this graph definition is defined
  "start" : "<code>", // R!  Type of resource at which the graph starts
  "profile" : "<canonical(StructureDefinition)>", // Profile on base resource
  "link" : [{ // Links this graph makes rules about
    "path" : "<string>", // Path in the resource that contains the link
    "sliceName" : "<string>", // Which slice (if profiled)
    "min" : <integer>, // Minimum occurrences for this link
    "max" : "<string>", // Maximum occurrences for this link
    "description" : "<string>", // Why this link is specified
    "target" : [{ // Potential target for the link
      "type" : "<code>", // R!  Type of resource this link refers to
      "params" : "<string>", // Criteria for reverse lookup
      "profile" : "<canonical(StructureDefinition)>", // Profile for the target resource
      "compartment" : [{ // Compartment Consistency Rules
        "use" : "<code>", // R!  condition | requirement
        "code" : "<code>", // R!  Patient | Encounter | RelatedPerson | Practitioner | Device
        "rule" : "<code>", // R!  identical | matching | different | custom
        "expression" : "<string>", // Custom rule, as a FHIRPath expression
        "description" : "<string>" // Documentation for FHIRPath expression
      }],
      "link" : [{ Content as for GraphDefinition.link }] // Additional links from target resource
    }]
  }]
}

Turtle Template

@prefix fhir: <http://hl7.org/fhir/> .doco


[ a fhir:GraphDefinition;
  fhir:nodeRole fhir:treeRoot; # if this is the parser root

  # from Resource: .id, .meta, .implicitRules, and .language
  # from DomainResource: .text, .contained, .extension, and .modifierExtension
  fhir:GraphDefinition.url [ uri ]; # 0..1 Canonical identifier for this graph definition, represented as a URI (globally unique)
  fhir:GraphDefinition.version [ string ]; # 0..1 Business version of the graph definition
  # GraphDefinition.versionAlgorithm[x] : 0..1 How to compare versions. One of these 2
    fhir:GraphDefinition.versionAlgorithmString [ string ]
    fhir:GraphDefinition.versionAlgorithmCoding [ Coding ]
  fhir:GraphDefinition.name [ string ]; # 1..1 I Name for this graph definition (computer friendly)
  fhir:GraphDefinition.title [ string ]; # 0..1 Name for this graph definition (human friendly)
  fhir:GraphDefinition.status [ code ]; # 1..1 draft | active | retired | unknown
  fhir:GraphDefinition.experimental [ boolean ]; # 0..1 For testing purposes, not real usage
  fhir:GraphDefinition.date [ dateTime ]; # 0..1 Date last changed
  fhir:GraphDefinition.publisher [ string ]; # 0..1 Name of the publisher/steward (organization or individual)
  fhir:GraphDefinition.contact [ ContactDetail ], ... ; # 0..* Contact details for the publisher
  fhir:GraphDefinition.description [ markdown ]; # 0..1 Natural language description of the graph definition
  fhir:GraphDefinition.useContext [ UsageContext ], ... ; # 0..* The context that the content is intended to support
  fhir:GraphDefinition.jurisdiction [ CodeableConcept ], ... ; # 0..* Intended jurisdiction for graph definition (if applicable)
  fhir:GraphDefinition.purpose [ markdown ]; # 0..1 Why this graph definition is defined
  fhir:GraphDefinition.start [ code ]; # 1..1 Type of resource at which the graph starts
  fhir:GraphDefinition.profile [ canonical(StructureDefinition) ]; # 0..1 Profile on base resource
  fhir:GraphDefinition.link [ # 0..* Links this graph makes rules about
    fhir:GraphDefinition.link.path [ string ]; # 0..1 Path in the resource that contains the link
    fhir:GraphDefinition.link.sliceName [ string ]; # 0..1 Which slice (if profiled)
    fhir:GraphDefinition.link.min [ integer ]; # 0..1 Minimum occurrences for this link
    fhir:GraphDefinition.link.max [ string ]; # 0..1 Maximum occurrences for this link
    fhir:GraphDefinition.link.description [ string ]; # 0..1 Why this link is specified
    fhir:GraphDefinition.link.target [ # 0..* Potential target for the link
      fhir:GraphDefinition.link.target.type [ code ]; # 1..1 Type of resource this link refers to
      fhir:GraphDefinition.link.target.params [ string ]; # 0..1 Criteria for reverse lookup
      fhir:GraphDefinition.link.target.profile [ canonical(StructureDefinition) ]; # 0..1 Profile for the target resource
      fhir:GraphDefinition.link.target.compartment [ # 0..* Compartment Consistency Rules
        fhir:GraphDefinition.link.target.compartment.use [ code ]; # 1..1 condition | requirement
        fhir:GraphDefinition.link.target.compartment.code [ code ]; # 1..1 Patient | Encounter | RelatedPerson | Practitioner | Device
        fhir:GraphDefinition.link.target.compartment.rule [ code ]; # 1..1 identical | matching | different | custom
        fhir:GraphDefinition.link.target.compartment.expression [ string ]; # 0..1 Custom rule, as a FHIRPath expression
        fhir:GraphDefinition.link.target.compartment.description [ string ]; # 0..1 Documentation for FHIRPath expression
      ], ...;
      fhir:GraphDefinition.link.target.link [ See GraphDefinition.link ], ... ; # 0..* Additional links from target resource
    ], ...;
  ], ...;
]

Changes since Release 4

GraphDefinition
GraphDefinition.versionAlgorithm[x]
  • Added Element
GraphDefinition.title
  • Added Element
GraphDefinition.link.target.type
  • Change value set from http://hl7.org/fhir/ValueSet/resource-types|4.0.0 to http://hl7.org/fhir/ValueSet/all-resource-types|5.0.0-ballot
  • Change value set from http://hl7.org/fhir/ValueSet/resource-types|4.0.0 to http://hl7.org/fhir/ValueSet/all-resource-types|5.0.0-ballot

See the Full Difference for further information

This analysis is available as XML or JSON.

See R3 <--> R4 Conversion Maps (status = 1 test that all execute ok. All tests pass round-trip testing and 1 r3 resources are invalid (0 errors).)

 

Additional definitions: Master Definition XML + JSON, XML Schema/Schematron + JSON Schema, ShEx (for Turtle) , the spreadsheet version & the dependency analysis

PathDefinitionTypeReference
GraphDefinition.versionAlgorithm[x]

Indicates the mechanism used to compare versions to determine which is more current.

ExtensibleVersionAlgorithm
GraphDefinition.status

The lifecycle status of an artifact.

RequiredPublicationStatus
GraphDefinition.jurisdiction

This value set defines a base set of codes for country, country subdivision and region for indicating where a resource is intended to be used.

Note: The codes for countries and country subdivisions are taken from ISO 3166 icon while the codes for "supra-national" regions are from UN Standard country or area codes for statistical use (M49) icon.

ExtensibleJurisdiction ValueSet
GraphDefinition.start

All fhir data types

RequiredResourceType
GraphDefinition.link.target.type

All fhir data types (including abstract resources)

RequiredAllResourceTypes
GraphDefinition.link.target.compartment.use

Defines how a compartment rule is used.

RequiredGraphCompartmentUse
GraphDefinition.link.target.compartment.code

Which type a compartment definition describes.

RequiredCompartmentType
GraphDefinition.link.target.compartment.rule

How a compartment must be linked.

RequiredGraphCompartmentRule

UniqueKeyLevelLocationDescriptionExpression
img cnl-0Warning (base)Name should be usable as an identifier for the module by machine processing applications such as code generationname.exists() implies name.matches('[A-Z]([A-Za-z0-9_]){1,254}')
img cnl-1Warning GraphDefinition.urlURL should not contain | or # - these characters make processing canonical references problematicurl.matches('([^|#])*')

The GraphDefinition resource can be used to:

  • Summarize a set of profiles on resources
  • Define a graph of resources to return in a query
  • Define a graph of resources to include in a document
  • Document rules about the relationship between a set of resources e.g. must all resources concern the same patient?

FHIR resources are relatively granular. In many/most cases, many resources are needed to handle any particular task. A typical example of this is a complex diagnostic report: it will start with a DiagnosticReport, which will link to a set of panels (Observation resources), each of which link to a set of Observation resources for atomic data items.

One way to represent this is to profile each of the resources, creating hundreds of profiles, and then leave it to the user to infer the overall pattern of the report from the detailed profiles for each observation in the report. But it's not easy to see the forest for the trees. A GraphDefinition can summarize the overall picture and present a summary to the user.

Here's an example icon of the kind of summary this represents. (Todo: make this an actual graph definition, and clone into the main spec)

As another example of using many resources, to completely represent a medication dispense, an application needs not only the MedicationDispense resource, but also resources to represent the patient, provider, organizations, and the associated prescription.

A client can retrieve a single resource:

  GET [base]/MedicationDispense/example

Then, when it reads the returned resource, it can fetch the referenced resources:

  GET [base]/Patient/example
  GET [base]/Practitioner/example
  GET [base]/MedicationRequest/example
  ... etc.

This is a very inefficient way to retrieve all the required resources. An alternative approach is to do a search, and _include the required resources:

  GET [base]/MedicationDispense?_id=example
    &_include=MedicationDispense:authorizingPrescription
    &_include=MedicationDispense:subject

But scaling this approach to fetch a full package with its dependencies becomes increasingly difficult as the package gets deeper. A graph definition can be used instead to inform the server what to return with the resource using the $graph operation:

  GET [base]/MedicationDispense/example/$graph?graph=med-package

This is a request to return a graph of resource, using the graph definition 'med-package'. In this case, the graph definition would look approximately like this:

MedicationDispense
  .subject
  .context
  .performer.actor
  .authorizingPrescription
     .requester.agent 
  .substitution.responsibleParty

Systems may either provide a pre-defined list of graph definitions that clients may choose from, or allow clients to define their own GraphDefinition resources and then refer to them.

Server may also allow clients also pass in their own graph definition using a text representation:

  GET [base]/MedicationDispense/example/$graph?definition=Patient{managingOrganization:Organization{endpoint:Endpoint}}

See below for further details.

A very similar issue applies when building a document using the $document operation. A document must include all the resources linked directly from the composition, but whether to include additional linked resources is at the discretion of the document author. How does the user inform the $document operation which linked resources to include? One option is a boolean flag for including all linked data, but this may be extensive - up to an entire patient record - and may include resources that are not desired.

An operation can use a graph definition as a parameter to the $document operation:

GET [base]/Composition/example/$document?graph=example

This tells the server to include the graph of resources defined in the example GraphDefinition - in this case, any resources referred to from lists, when the section content is a list. Alternatively, servers may allow a client to pass in a definition directly (as shown above) using the parameter definition.

One important question about the use of resources is cross-resource consistency. For example, if an Observation refers to both a Patient and Encounter, does the Encounter have to refer to the same patient?

In general, the answer to this is that it usually should - the record needs to be consistent. However there are edge cases where the references may differ. For example, with regard to patient references, they may differ for:

  • Health Records concerning mother and baby
  • Organ Transplants
  • Counselling, particularly family counselling

Other reasons for the references to differ - mixing records about the same patient from different servers, or specific records about patients mixed with records about groups of patients (particularly common in veterinarian care).

The GraphDefinition resource allows for compartment consistency rules to be made regarding the links between resources. For each link in the graph, the graph definition can make a rule about the compartment consistency. The rule can specify one of the following consistencies:

CodeMeaning
identicalThe compartment must be identical (the same literal reference)
matchingThe compartment must be the same - the record must be about the same patient, but the reference may be different
differentThe compartment must be different
customThe compartment rule is defined in the accompanying FHIRPath expression

Todo: how would this be validated? - where is the graph referred to?

GraphDefinition can walk a graph forward through the links, which is the natural order. As an example, consider a profile on composition that wants to specify that the graph follows the section entry into a list:

    <!-- 
      starting from a Composition...
    -->
  <link>
    <!-- 
      follow and Composition.section.entry that refers to a list
    -->
    <path value="Composition.section.entry"/>
    <target>
      <type value="List"/>      
      <!-- and inside this list, follow any items -->
      <link>
        <path value="List.entry.item"/>
        <target>
          <type value="Resource"/> 
        </target>
      </link>      
    </target>
  </link>

The pattern can be extended to require that the none of the resources in this little graph reference a different patient - that is, it is a requirement when traversing the links that the patient compartment remain identical:

  <link>
    <path value="Composition.section.entry"/>
    <target>
      <type value="List"/>      
        <compartment>
          <use value="requirement"/>
          <code value="Patient"/>
          <rule value="identical"/>
        </compartment>
      </target>
      <link>
        <path value="List.entry.item"/>
        <description value="Include any list entries"/>
        <target>
          <type value="Resource"/> 
          <compartment>
            <use value="requirement"/>
            <code value="Patient"/>
            <rule value="identical"/>
          </compartment>
        </target>
      </link>      
    </target>
  </link>

Another useful approach is to walk any link * (e.g. wildcard support):

  <link>
    <!-- 
      follow all links that refers to a list
    -->
    <path value="*"/>
    <target>
      <type value="List"/>      
      <!-- and inside this list, follow any references -->
      <link>
        <path value="*"/>
        <target>
          <type value="Resource"/> 
        </target>
      </link>      
    </target>
  </link>

or you can follow any links in any resource:

  <link>
    <!-- 
      follow all links 
    -->
    <path value="*"/>
    <target>
      <type value="Resource"/>      
      <!-- and inside the target, follow any links -->
      <link>
        <path value="*"/>
        <target>
          <type value="Resource"/> 
        </target>
      </link>      
    </target>
  </link>

It's also possible to build a graph by walking links in reverse. This technique is useful, for example, when including provenance resources in a document:

  <link>
    <!-- if the path is missing <path value=""/> -->
    <target>
      <!-- 
        any provenance
      -->
      <type value="Provenance"/>
      <!--
        and specify the search parameters to include 
        all the provenances that refer to this resource
      -->
      <params value="target={ref}"/>      
    </target>
  </link>

For convenience, a graph definition may be represented using a text short hand form, loosely based on the graphQL language. A graph definition is introduced by the name of the Resource (GraphDefinition.start, followed by an optional profile in parentheses (GraphDefinition.profile, then a group of links, surrounded by { and }:

Patient(http://hl7.org/fhir/us/core/Patient) { 
}

Between the brackets are one or more links (GraphDefinition.link), separated by commas. Links statements can either be path-based look ups, or a search to perform a reverse lookup:

Patient { 
  managingOrganization : Organization,
  generalPractitioner : Practitioner,
  search Observation?patient={ref}
}

The format for a path-based look up is:

  [path] cardinality [min]..[max] '[description]' : [ResoureType rules]

where:

  • path = GraphDefinition.link.path
  • cardinality [min]..[max] is optional, and min = GraphDefinition.link.min and max = GraphDefinition.link.max
  • description is optional, and = GraphDefinition.link.description

The resource type rules statement consists of one or more of the following, separated by ; characters:

  [ResourceType] (profile)  

where:

  • ResourceType = GraphDefinition.link.target.type
  • profile is optional, and = GraphDefinition.link.target.profile
  • description is optional, and = GraphDefinition.link.description

In addition, the resource type rule may be followed by a links section, surrounded by {}, with the content as described above.

Search statements for reverse look ups have a slightly different format:

Patient{ 
  search [ResourceType]?[params] cardinality [min]..[max] '[description]' 
}

where:

  • ResourceType = GraphDefinition.link.target.type
  • params = GraphDefinition.link.target.params
  • cardinality [min]..[max] is optional, and min = GraphDefinition.link.min and max = GraphDefinition.link.max
  • description is optional, and = GraphDefinition.link.description

In this format, the amount of whitespace, and its form, is irrelevant. For the purposes of clarity, the examples here are laid out on different lines, but this is not required. When a GraphDefinition is used as a parameter in a url, no whitespace is used.

Here is a full example that uses all the features of the syntax:


Patient(http://hl7.org/fhir/us/core/Patient) { 
  managingOrganization cardinality 0..1 'description of item' : 
    Organization(http://hl7.org/fhir/us/core/Organization) { 
      endpoint : Endpoint 
    };
    Basic;
    Group { 
      item : Patient 
    },
  generalPractitioner : Organization,
  search Observation?patient={ref} cardinality 0..10 'Observations for the patient' {
    performer : Practitioner,
    related.where(type='has-member').target : Observation require matching Patient,
    related.where(type='derived-from').target : Observation where identical Patient,
    related.where(type='sequel-to').target : Observation where different Patient,
    related.where(type='qualified-by').target : Observation where custom Patient = path
  }
}

Search parameters for this resource. The common parameters also apply. See Searching for more information about searching in REST, messaging, and services.

NameTypeDescriptionExpressionIn Common
contexttokenA use context assigned to the graph definition(GraphDefinition.useContext.value as CodeableConcept)
context-quantityquantityA quantity- or range-valued use context assigned to the graph definition(GraphDefinition.useContext.value as Quantity) | (GraphDefinition.useContext.value as Range)
context-typetokenA type of use context assigned to the graph definitionGraphDefinition.useContext.code
context-type-quantitycompositeA use context type and quantity- or range-based value assigned to the graph definitionOn GraphDefinition.useContext:
  context-type: code
  context-quantity: value.ofType(Quantity) | value.ofType(Range)
context-type-valuecompositeA use context type and value assigned to the graph definitionOn GraphDefinition.useContext:
  context-type: code
  context: value.ofType(CodeableConcept)
date NdateThe graph definition publication dateGraphDefinition.date
description NstringThe description of the graph definitionGraphDefinition.description
jurisdictiontokenIntended jurisdiction for the graph definitionGraphDefinition.jurisdiction
name NstringComputationally friendly name of the graph definitionGraphDefinition.name
publisher NstringName of the publisher of the graph definitionGraphDefinition.publisher
start NtokenType of resource at which the graph startsGraphDefinition.start
status NtokenThe current status of the graph definitionGraphDefinition.status
url NuriThe uri that identifies the graph definitionGraphDefinition.url
version NtokenThe business version of the graph definitionGraphDefinition.version