SMART Base
0.3.0 - ci-build
SMART Base, published by WHO. This guide is not an authorized publication; it is the continuous build for version 0.3.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/litlfred/smart-base/ and changes regularly. See the Directory of published versions
| Active as of 2026-10-06 |
Definitions for the KGEdge logical model.
Guidance on how to interpret the contents of this table can be foundhere
| 0. KGEdge | |
| Definition | One reified statement: a predicate from a source node to a target node, with its derivation and evidence. |
| Short | Knowledge graph: edge |
| Control | 0..* |
| Is Modifier | false |
| Logical Model | Instances of this logical model are not marked to be the target of a Reference |
| 2. KGEdge.type | |
| Definition | Always Statement (rdf:Statement). |
| Short | Type |
| Control | 1..1 |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 4. KGEdge.predicate | |
| Definition | The predicate; the layer's edge table says which (source, target) pairs it licenses. |
| Short | Predicate |
| Control | 1..1 |
| Binding | The codes SHALL be taken from Knowledge graph L1: predicates (required to http://smart.who.int/base/ValueSet/KGL1PredicatesVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 6. KGEdge.source | |
| Definition | IRI of the source node. |
| Short | Source |
| Control | 1..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 8. KGEdge.target | |
| Definition | IRI of the target node. |
| Short | Target |
| Control | 1..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 10. KGEdge.qualifier | |
| Definition | A label on the relationship. |
| Short | Qualifier |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 12. KGEdge.derivation | |
| Definition | derived | inferred | decided. |
| Short | Derivation |
| Control | 1..1 |
| Binding | The codes SHALL be taken from Knowledge graph: derivation (required to http://smart.who.int/base/ValueSet/KGDerivationVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 14. KGEdge.note | |
| Definition | Why it is what it is. Required unless derived. |
| Short | Note |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 16. KGEdge.evidence | |
| Definition | Where it came from. Required unless derived. |
| Short | Evidence |
| Control | 0..1 |
| Type | http://smart.who.int/base/StructureDefinition/KGEvidenceLocation |
| 18. KGEdge.flagRef | |
| Definition | Id of a flag raised while extracting this edge. |
| Short | Flag |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 20. KGEdge.skill | |
| Definition | Skill id that produced this edge. |
| Short | Skill |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 22. KGEdge.properties | |
| Definition | Fields of the statement itself. |
| Short | Properties |
| Control | 0..1 |
| Type | BackboneElement |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) |
| 24. KGEdge.properties.id | |
| Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | Unique id for inter-element referencing |
| Control | 0..1 |
| Type | string |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| 26. KGEdge.properties.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Is Modifier | false |
| Summary | false |
| Alternate Names | extensions, user content |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) |
| Slicing | This element introduces a set of slices on KGEdge.properties.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 28. KGEdge.properties.modifierExtension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). |
| Short | Extensions that cannot be ignored even if unrecognized |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Is Modifier | true because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them |
| Summary | true |
| Requirements | Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. |
| Alternate Names | extensions, user content, modifiers |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) |
| 30. KGEdge.properties.resolutionStatus | |
| Definition | For a cross-format join: unresolved | resolved | ambiguous. |
| Short | Resolution status |
| Control | 0..1 |
| Binding | The codes SHALL be taken from Knowledge graph: resolution status (required to http://smart.who.int/base/ValueSet/KGResolutionStatusVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 32. KGEdge.properties.matchedOn | |
| Definition | What the join was matched on. |
| Short | Matched on |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
Guidance on how to interpret the contents of this table can be foundhere
| 0. KGEdge | |
| Definition | One reified statement: a predicate from a source node to a target node, with its derivation and evidence. |
| Short | Knowledge graph: edge |
| Logical Model | Instances of this logical model are not marked to be the target of a Reference |
| 2. KGEdge.type | |
| Definition | Always Statement (rdf:Statement). |
| Short | Type |
| Control | 1..1 |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 4. KGEdge.predicate | |
| Definition | The predicate; the layer's edge table says which (source, target) pairs it licenses. |
| Short | Predicate |
| Control | 1..1 |
| Binding | The codes SHALL be taken from Knowledge graph L1: predicates (required to http://smart.who.int/base/ValueSet/KGL1PredicatesVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 6. KGEdge.source | |
| Definition | IRI of the source node. |
| Short | Source |
| Control | 1..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 8. KGEdge.target | |
| Definition | IRI of the target node. |
| Short | Target |
| Control | 1..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 10. KGEdge.qualifier | |
| Definition | A label on the relationship. |
| Short | Qualifier |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 12. KGEdge.derivation | |
| Definition | derived | inferred | decided. |
| Short | Derivation |
| Control | 1..1 |
| Binding | The codes SHALL be taken from Knowledge graph: derivation (required to http://smart.who.int/base/ValueSet/KGDerivationVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 14. KGEdge.note | |
| Definition | Why it is what it is. Required unless derived. |
| Short | Note |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 16. KGEdge.evidence | |
| Definition | Where it came from. Required unless derived. |
| Short | Evidence |
| Control | 0..1 |
| Type | http://smart.who.int/base/StructureDefinition/KGEvidenceLocation |
| 18. KGEdge.flagRef | |
| Definition | Id of a flag raised while extracting this edge. |
| Short | Flag |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 20. KGEdge.skill | |
| Definition | Skill id that produced this edge. |
| Short | Skill |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 22. KGEdge.properties | |
| Definition | Fields of the statement itself. |
| Short | Properties |
| Control | 0..1 |
| Type | BackboneElement |
| 24. KGEdge.properties.resolutionStatus | |
| Definition | For a cross-format join: unresolved | resolved | ambiguous. |
| Short | Resolution status |
| Control | 0..1 |
| Binding | The codes SHALL be taken from Knowledge graph: resolution status (required to http://smart.who.int/base/ValueSet/KGResolutionStatusVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 26. KGEdge.properties.matchedOn | |
| Definition | What the join was matched on. |
| Short | Matched on |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
Guidance on how to interpret the contents of this table can be foundhere
| 0. KGEdge | |
| Definition | One reified statement: a predicate from a source node to a target node, with its derivation and evidence. |
| Short | Knowledge graph: edge |
| Control | 0..* |
| Is Modifier | false |
| Logical Model | Instances of this logical model are not marked to be the target of a Reference |
| 2. KGEdge.type | |
| Definition | Always Statement (rdf:Statement). |
| Short | Type |
| Control | 1..1 |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 4. KGEdge.predicate | |
| Definition | The predicate; the layer's edge table says which (source, target) pairs it licenses. |
| Short | Predicate |
| Control | 1..1 |
| Binding | The codes SHALL be taken from Knowledge graph L1: predicates (required to http://smart.who.int/base/ValueSet/KGL1PredicatesVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 6. KGEdge.source | |
| Definition | IRI of the source node. |
| Short | Source |
| Control | 1..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 8. KGEdge.target | |
| Definition | IRI of the target node. |
| Short | Target |
| Control | 1..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 10. KGEdge.qualifier | |
| Definition | A label on the relationship. |
| Short | Qualifier |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 12. KGEdge.derivation | |
| Definition | derived | inferred | decided. |
| Short | Derivation |
| Control | 1..1 |
| Binding | The codes SHALL be taken from Knowledge graph: derivation (required to http://smart.who.int/base/ValueSet/KGDerivationVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 14. KGEdge.note | |
| Definition | Why it is what it is. Required unless derived. |
| Short | Note |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 16. KGEdge.evidence | |
| Definition | Where it came from. Required unless derived. |
| Short | Evidence |
| Control | 0..1 |
| Type | http://smart.who.int/base/StructureDefinition/KGEvidenceLocation |
| 18. KGEdge.flagRef | |
| Definition | Id of a flag raised while extracting this edge. |
| Short | Flag |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 20. KGEdge.skill | |
| Definition | Skill id that produced this edge. |
| Short | Skill |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 22. KGEdge.properties | |
| Definition | Fields of the statement itself. |
| Short | Properties |
| Control | 0..1 |
| Type | BackboneElement |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) |
| 24. KGEdge.properties.id | |
| Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | Unique id for inter-element referencing |
| Control | 0..1 |
| Type | string |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| 26. KGEdge.properties.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Is Modifier | false |
| Summary | false |
| Alternate Names | extensions, user content |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists()) |
| Slicing | This element introduces a set of slices on KGEdge.properties.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 28. KGEdge.properties.modifierExtension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). |
| Short | Extensions that cannot be ignored even if unrecognized |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Is Modifier | true because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them |
| Summary | true |
| Requirements | Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. |
| Alternate Names | extensions, user content, modifiers |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists()) |
| 30. KGEdge.properties.resolutionStatus | |
| Definition | For a cross-format join: unresolved | resolved | ambiguous. |
| Short | Resolution status |
| Control | 0..1 |
| Binding | The codes SHALL be taken from Knowledge graph: resolution status (required to http://smart.who.int/base/ValueSet/KGResolutionStatusVS) |
| Type | code |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| 32. KGEdge.properties.matchedOn | |
| Definition | What the join was matched on. |
| Short | Matched on |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |