openaire-graph-docs/versioned_docs/version-5.1.0/data-model/relationships.md

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Relationships

A relationship in the graph is represented by the following data type, which aims to model a directed edge between two nodes, providing information about the semantic of the relation, its provenance and validation.

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The Relationship object

source

Type: Node • Cardinality: ONE

Represents the source node in the relation.

"source": {
    "id": "20|openorgs____::1cb75a3ad756e4c83e455e3e7347643b",
    "type": "organization"
}

target

Type: Node • Cardinality: ONE

Represents the target node in the relation.

"target": {
    "id": "10|doajarticles::022409068174087a003647ff46070f7f",
    "type": "datasource"
}

reltype

Type: RelType • Cardinality: ONE

Represent the semantics of the relation between two nodes of the graph.

"reltype": {
    "name": "provides",
    "type": "provision"
}

provenance

Type: Provenance • Cardinality: ONE

Indicates the process that produced (or provided) the information.

"provenance": {
    "provenance": "Harvested",
    "trust":"0.900"
}

validated

Type: Boolean • Cardinality: ONE

Indicates weather or not the relation was validated.

"validated": true

validationDate

Type: String • Cardinality: ONE

Indicates the validation date of the relation - applies only when the validated flag is set to true.

"validationDate": "2022-09-02"

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The Node object

The Node data type contains the minimum information needed to identify a graph node, its identifier and entity type.

id

Type: String • Cardinality: ONE

OpenAIRE identifier of the node in the graph.

"id": "10|doajarticles::022409068174087a003647ff46070f7f"

type

Type: String • Cardinality: ONE

Graph node type.

"type": "datasource"

The RelType object

The RelType data type models the semantic of the relationship among two nodes.

type

Type: String • Cardinality: ONE

Relation category, e.g. affiliation, citation, see table Relation typologies.

"name": "provides"

name

Type: String • Cardinality: ONE

Further specifies the relation semantic, indicating the relation direction, e.g. Cites, isCitedBy.

"type": "provision"

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Relationship types

The following table lists all the possible relation semantics found in the graph dump.

Note: the labels used to specify the semantic of the relationships are (for the large) inherited from the DataCite metadata kernel, which provides a description for them.

#	Source entity type	Target entity type	Relation name / inverse	Provenance
1	Project	Result	produces / isProducedBy	Harvested, Inferred by OpenAIRE, Linked by user
2	Project	Organization	hasParticipant / isParticipant	Harvested
3	Project	Community	isRelatedTo / isRelatedTo	Linked by user
4	Result	Result	isAmongTopNSimilarDocuments / HasAmongTopNSimilarDocuments	Inferred by OpenAIRE
5	Result	Result	isSupplementTo / isSupplementedBy	Harvested
6	Result	Result	isRelatedTo / isRelatedTo	Harvested, Inferred by OpenAIRE, Linked by user
7	Result	Result	IsPartOf / HasPart	Harvested
8	Result	Result	IsDocumentedBy / Documents	Harvested
9	Result	Result	IsObsoletedBy / Obsoletes	Harvested
10	Result	Result	IsSourceOf / IsDerivedFrom	Harvested
11	Result	Result	IsCompiledBy / Compiles	Harvested
12	Result	Result	IsRequiredBy / Requires	Harvested
13	Result	Result	IsCitedBy / Cites	Harvested, Inferred by OpenAIRE
14	Result	Result	IsReferencedBy / References	Harvested
15	Result	Result	IsReviewedBy / Reviews	Harvested
16	Result	Result	IsOriginalFormOf / IsVariantFormOf	Harvested
17	Result	Result	IsVersionOf / HasVersion	Harvested
18	Result	Result	IsIdenticalTo / IsIdenticalTo	Harvested
19	Result	Result	IsPreviousVersionOf / IsNewVersionOf	Harvested
20	Result	Result	IsContinuedBy / Continues	Harvested
21	Result	Result	IsDescribedBy / Describes	Harvested
22	Result	Organization	hasAuthorInstitution / isAuthorInstitutionOf	Harvested, Inferred by OpenAIRE
23	Result	Data source	isHostedBy / hosts	Harvested, Inferred by OpenAIRE
24	Result	Data source	isProvidedBy / provides	Harvested
25	Result	Community	isRelatedTo / isRelatedTo	Harvested, Inferred by OpenAIRE, Linked by user
26	Organization	Community	isRelatedTo / isRelatedTo	Linked by user
27	Data source	Community	isRelatedTo / isRelatedTo	Linked by user
28	Data source	Organization	isProvidedBy / provides	Harvested