openaire-graph-docs/docs/data-model/relationships/relationship-types.md

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# Relationship types
The following table lists all the possible relation semantics found in the Graph Dataset.
Note: the labels used to specify the semantic of the relationships are (for the large) inherited from the [DataCite metadata kernel](https://schema.datacite.org/meta/kernel-4.4/doc/DataCite-MetadataKernel_v4.4.pdf), which provides a description for them.
| # | Source entity type | Target entity type | Relation name / inverse | Provenance |
|:--:|:--------------------------------------:|:--------------------------------------:|:----------------------------------------------------------:|:-----------------------------------------------:|
| 1 | [Project](/data-model/entities/project) | [ResearchProduct](../../data-model/entities/research-product) | produces / isProducedBy | Harvested, Inferred by OpenAIRE, Linked by user |
| 2 | [Project](/data-model/entities/project) | [Organization](/data-model/entities/organization) | hasParticipant / isParticipant | Harvested |
| 3 | [Project](/data-model/entities/project) | [Community](/data-model/entities/community) | IsRelatedTo / IsRelatedTo | Linked by user |
| 4 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsAmongTopNSimilarDocuments / HasAmongTopNSimilarDocuments | Inferred by OpenAIRE |
| 5 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsSupplementTo / IsSupplementedBy | Harvested |
| 6 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsRelatedTo / IsRelatedTo | Harvested, Inferred by OpenAIRE, Linked by user |
| 7 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsPartOf / HasPart | Harvested |
| 8 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsDocumentedBy / Documents | Harvested |
| 9 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsObsoletedBy / Obsoletes | Harvested |
| 10 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsSourceOf / IsDerivedFrom | Harvested |
| 11 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsCompiledBy / Compiles | Harvested |
| 12 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsRequiredBy / Requires | Harvested |
| 13 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsCitedBy / Cites | Harvested, Inferred by OpenAIRE |
| 14 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsReferencedBy / References | Harvested |
| 15 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsReviewedBy / Reviews | Harvested |
| 16 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsOriginalFormOf / IsVariantFormOf | Harvested |
| 17 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsVersionOf / HasVersion | Harvested |
| 18 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsIdenticalTo / IsIdenticalTo | Harvested |
| 19 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsPreviousVersionOf / IsNewVersionOf | Harvested |
| 20 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsContinuedBy / Continues | Harvested |
| 21 | [ResearchProduct](../../data-model/entities/research-product) | [ResearchProduct](../../data-model/entities/research-product) | IsDescribedBy / Describes | Harvested |
| 22 | [ResearchProduct](../../data-model/entities/research-product) | [Organization](/data-model/entities/organization) | hasAuthorInstitution / isAuthorInstitutionOf | Harvested, Inferred by OpenAIRE |
| 23 | [ResearchProduct](../../data-model/entities/research-product) | [Data source](/data-model/entities/data-source) | isHostedBy / hosts | Harvested, Inferred by OpenAIRE |
| 24 | [ResearchProduct](../../data-model/entities/research-product) | [Data source](/data-model/entities/data-source) | isProvidedBy / provides | Harvested |
| 25 | [ResearchProduct](../../data-model/entities/research-product) | [Community](/data-model/entities/community) | IsRelatedTo / IsRelatedTo | Harvested, Inferred by OpenAIRE, Linked by user |
| 26 | [Organization](/data-model/entities/organization) | [Community](/data-model/entities/community) | IsRelatedTo / IsRelatedTo | Linked by user |
| 27 | [Organization](/data-model/entities/organization) | [Organization](/data-model/entities/organization) | IsChildOf / IsParentOf | Linked by user |
| 28 | [Data source](/data-model/entities/data-source) | [Community](/data-model/entities/community) | IsRelatedTo / IsRelatedTo | Linked by user |
| 29 | [Data source](/data-model/entities/data-source) | [Organization](/data-model/entities/organization) | isProvidedBy / provides | Harvested |