Wikidata:WikiProject Datasets/Data Structure/DCAT - Wikidata - Schema.org mapping
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This is a working draft intended to document a mapping exercise between DCAT, Schema.org and Wikidata.
The mappings here defined refer to the following documents:
Important:
- Not all classes have yet been mapped. As for the classes specified by the DCAT application profile, only mandatory and recommended classes have been mapped. For the properties, a mapping has been done for Dataset and Distribution.
- Not all properties marked with [NEW PROPERTY] below have yet been proposed. Properties should only be proposed if they are actually going to be used. So feel free to propose them if you need these properties in a certain context.
DCAT Application Profile Classes[edit]
Mandatory Classes[edit]
| DCAT Class name | Usage note for the DCAT Application Profile | DCAT URI | Reference | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|
| Agent | An entity that is associated with Catalogues and/or Datasets. If the Agent is an organisation, the use of the Organization Ontology is recommended. See section 7 for a discussion on Agent roles. | foaf:Agent | http://xmlns.com/foaf/spec/#term_Agent , http://www.w3.org/TR/vocab-org/ | schema:Agent | agent (Q24229398) |
| Catalogue | A catalogue or repository that hosts the Datasets being described. | dcat:Catalog | http://www.w3.org/TR/2013/WD-vocab-dcat-20130312/#class-catalog | schema:DataCatalog | catalog (Q29937289) |
| Dataset | A conceptual entity that represents the information published. | dcat:Dataset | http://www.w3.org/TR/2013/WD-vocab-dcat-20130312/#class-dataset | schema:Dataset | data set (Q1172284) |
| Literal | A literal value such as a string or integer; Literals may be typed, e.g. as a date according to xsd:date. Literals that contain human-readable text have an optional language tag as defined by BCP 47. | rdfs:Literal | http://www.w3.org/TR/rdf-concepts/#section-Literals | schema:PropertyValue | Literal (Q121572) |
| Resource | Anything described by RDF. | rdfs:Resource | http://www.w3.org/TR/rdf-schema/#ch_resource | schema:DataDownload | web resource (Q3427877) |
Recommended Classes[edit]
| DCAT Class name | Usage note for the DCAT Application Profile | DCAT URI | Reference | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|
| Category | A subject of a Dataset. | skos:Concept | http://www.w3.org/TR/2013/WD-vocab-dcat-20130312/#class-category-and-category-scheme | pending.schema:CategoryCode
(defined in the pending.schema.org extension) |
?? |
| Category scheme | A concept collection (e.g. controlled vocabulary) in which the Category is defined. | skos:ConceptScheme | http://www.w3.org/TR/2013/WD-vocab-dcat-20130312/#class-category-and-category-scheme | pending.schema:CategoryCodeSet
(defined in the pending.schema.org extension) |
?? |
| Distribution | A physical embodiment of the Dataset in a particular format. | dcat:Distribution | http://www.w3.org/TR/2013/WD-vocab-dcat-20130312/#class-distribution | schema:DataDownload
(as described at http://schema.org/distribution) |
digital distribution (Q269415)
(to be discussed) |
| Licence document | A legal document giving official permission to do something with a resource. | dct:LicenseDocument | http://dublincore.org/documents/2012/06/14/dcmi-terms/?v=terms#LicenseDocument | schema:CreativeWork
(as described at schema:license) |
license (Q79719) |
Optional Classes[edit]
[Contribution needed] Do a mapping for the remaining classes here if you need them anywhere.
| DCAT Class name | Usage note for the DCAT Application Profile | DCAT URI | Reference | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|
| TBD | TBD | TBD | TBD | TBD | TBD |
Properties per Class[edit]
Dataset[edit]
Mandatory properties[edit] | ||||||
| DCAT Property name | DCAT URI | Range | Usage note | Card. | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|---|
| description | dct:description | rdfs:Literal | This property contains a free-text account of the Dataset. This property can be repeated for parallel language versions of the description. | 1..n | schema:description | description |
| title | dct:title | rdfs:Literal | This property contains a name given to the Dataset. This property can be repeated for parallel language versions of the name. | 1..n | schema:name | label |
Recommended properties[edit] | ||||||
| contact point | dcat:contactPoint | vcard:Kind | This property contains contact information that can be used for sending comments about the Dataset. | 0..n | schema:contactPoint | 1st proposal (Not done) 2nd proposal (Not done) |
| dataset distribution | dcat:distribution | dcat:Distribution | This property links the Dataset to an available Distribution. | 0..n | schema:distribution | dataset distribution (P2702) |
| keyword/ tag | dcat:keyword | rdfs:Literal | This property contains a keyword or tag describing the Dataset. | 0..n | schema:keywords | can be omitted or be represented by specific properties |
| publisher | dct:publisher | foaf:Agent | This property refers to an entity (organisation) responsible for making the Dataset available. | 0..1 | schema:publisher | publisher (P123) |
| theme/ category | dcat:theme, subproperty of dct:subject | skos:Concept | This property refers to a category of the Dataset. A Dataset may be associated with multiple themes. | 0..n | schema:about | main subject:P921 |
Optional properties[edit] | ||||||
| access rights | dct:accessRights | dct:RightsStatement | This property refers to information that indicates whether the Dataset is open data, has access restrictions or is not public. A controlled vocabulary with three members (:public, :restricted, :non-public) will be created and maintained by the Publications Office of the EU. | 0..1 | ?? | [NEW PROPERTY] |
| conforms to | dct:conformsTo | dct:Standard | This property refers to an implementing rule or other specification. | 0..n | ?? | [NEW PROPERTY] |
| documentation | foaf:page | foaf:Document | This property refers to a page or document about this Dataset. | 0..n | schema:url | URL (P2699) with qualifier of pointing to documentation (Q788790) |
| frequency | dct:accrualPeriodicity | dct:Frequency | This property refers to the frequency at which the Dataset is updated. | 0..1 | ?? | publication interval (P2896) |
| has version | dct:hasVersion | dcat:Dataset | This property refers to a related Dataset that is a version, edition, or adaptation of the described Dataset. | 0..n | ?? | followed by (P156) |
| identifier | dct:identifier | rdfs:Literal | This property contains the main identifier for the Dataset, e.g. the URI or other unique identifier in the context of the Catalogue. | 0..n | schema:identifier | catalog code (P528) (optional with qualifier catalog (P972) |
| is version of | dct:isVersionOf | dcat:Dataset | This property refers to a related Dataset of which the described Dataset is a version, edition, or adaptation. | 0..n | ?? | follows (P155) |
| landing page | dcat:landingPage | foaf:Document | This property refers to a web page that provides access to the Dataset, its Distributions and/or additional information. It is intended to point to a landing page at the original data provider, not to a page on a site of a third party, such as an aggregator. | 0..n | schema:url | official website (P856) |
| language | dct:language | dct:LinguisticSystem | This property refers to a language of the Dataset. This property can be repeated if there are multiple languages in the Dataset. | 0..n | schema:inLanguage | language of work or name (P407) |
| other identifier | adms:identifier | adms:Identifier | This property refers to a secondary identifier of the Dataset, such as MAST/ADS, DataCite, DOI, EZID or W3ID | 0..n | schema:identifier | specific id property if needed |
| provenance | dct:provenance | dct:ProvenanceStatement | This property contains a statement about the lineage of a Dataset. | 0..n | ?? | [NEW PROPERTY] |
| related resource | dct:relation | rdfs:Resource | This property refers to a related resource. | 0..n | schema:url | URL (P2699) with qualifier of pointing to documentation (Q788790) |
| release date | dct:issued | rdfs:Literal typed as xsd:date or xsd:dateTime | This property contains the date of formal issuance (e.g., publication) of the Dataset. | 0..1 | schema:datePublished | publication date (P577) |
| sample | adms:sample | dcat:Distribution | This property refers to a sample distribution of the dataset | 0..n | schema:distribution | dataset distribution (P2702) with qualifier of (P642) with value example (Q14944328) |
| source | dct:source | dcat:Dataset | This property refers to a related Dataset from which the described Dataset is derived. | 0..n | schema:Dataset | tbd
Note: imported from Wikimedia project (P143) should probably not be used given its definition and scope of use. |
| spatial/ geographical coverage | dct:spatial | dct:Location | This property refers to a geographic region that is covered by the Dataset. | 0..n | schema:spatial | location (P276)
(as there is an example with the value "worldwide" in the Wikidata property example) |
| temporal coverage | dct:temporal | dct:PeriodOfTime | This property refers to a temporal period that the Dataset covers. | 0..n | schema:datasetTimeInterval | According to the description, start of covered period (P7103) and end of covered period (P7104) are appropriate. "4.11.1 Optional properties for Period of Time" in DCAT-AP v1.1 says schema:startDate and schema:endDate are the corresponding properties, and start time (P580) and end time (P582) says they are equivalent to those. (These relationships imply that start of covered period (P7103) should be the sub-property of start time (P580)). |
| type | dct:type | skos:Concept | This property refers to the type of the Dataset. A controlled vocabulary for the values has not been established. | 0..1 | ?? | specific property if needed |
| update/ modification date | dct:modified | rdfs:Literal typed as xsd:date or xsd:dateTime | This property contains the most recent date on which the Dataset was changed or modified. | 0..1 | schema:dateModified | significant event (P793) < reduction of the property >
point in time (P585) < date > or new property changed, depending on the outcome of the property proposal Note: The usefulness of this property in a non-automatized environment would need to be discussed. |
| version | owl:versionInfo | rdfs:Literal | This property contains a version number or other version designation of the Dataset. | 0..1 | schema:version | [NEW PROPERTY] |
| version notes | adms:versionNotes | rdfs:Literal | This property contains a description of the differences between this version and a previous version of the Dataset. This property can be repeated for parallel language versions of the version notes. | 0..n | ?? | [NEW PROPERTY] |
Distribution[edit]
Mandatory properties[edit] | ||||||
| DCAT Property name | DCAT URI | Range | Usage note | Card. | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|---|
| access URL | dcat:accessURL | rdfs:Resource | This property contains a URL that gives access to a Distribution of the Dataset. The resource at the access URL may contain information about how to get the Dataset. | 1..n | schema:url | URL (P2699) |
Recommended properties[edit] | ||||||
| description | dct:description | rdfs:Literal | This property contains a free-text account of the Distribution. This property can be repeated for parallel language versions of the description. | 0..n | schema:description | description |
| format | dct:format | dct:MediaTypeOrExtent | This property refers to the file format of the Distribution. | 0..1 | schema:fileFormat | file format (P2701) |
| licence | dct:license | dct:LicenseDocument | This property refers to the licence under which the Distribution is made available. | 0..1 | schema:keywords | license (P275) |
Optional properties[edit] | ||||||
| byte size | dcat:byteSize | rdfs:Literal typed as xsd:decimal | This property contains the size of a Distribution in bytes | 0..1 | schema:contentSize | data size (P3575) |
| checksum | spdx:checksum | spdx:Checksum | This property provides a mechanism that can be used to verify that the contents of a distribution have not changed | 0..1 | ?? | [NEW PROPERTY]
"checksum" with qualifier "algorithm" |
| documentation | foaf:page | foaf:Document | This property refers to a page or document about this Distribution. | 0..n | schema:url | URL (P2699) with qualifier of (P642) pointing to technical documentation |
| download URL | dcat:downloadURL | rdfs:Resource | This property contains a URL that is a direct link to a downloadable file in a given format. | 0..n | schema:contentURL | URL (P2699) with qualifier of (P642) pointing to download (Q7126717) |
| language | dct:language | dct:LinguisticSystem | This property refers to a language used in the Distribution. This property can be repeated if the metadata is provided in multiple languages. | 0..n | schema:inLanguage | language (P407) |
| linked schemas | dct:conformsTo | dct:Standard | This property refers to an established schema to which the described Distribution conforms. | 0..n | ?? | [NEW PROPERTY] |
| media type | dcat:mediaType, subproperty of dct:format | dct:MediaTypeOrExtent | This property refers to the media type of the Distribution as defined in the official register of media types managed by IANA. | 0..1 | schema:fileFormat | media type (P1163) |
| release date | dct:issued | rdfs:Literal typed as xsd:date or xsd:dateTime | This property contains the date of formal issuance (e.g., publication) of the Distribution. | 0..1 | schema:datePublished | publication date (P577) |
| rights | dct:rights | dct:RightsStatement | This property refers to a statement that specifies rights associated with the Distribution. | 0..1 | ?? | [NEW PROPERTY] |
| status | adms:status | skos:Concept | This property refers to the maturity of the Distribution | 0..1 | ?? | [NEW PROPERTY] |
| title | dct:title | rdfs:Literal | This property contains a name given to the Distribution. This property can be repeated for parallel language versions of the description. | 0..n | schema:name | label |
| update/ modification date | dct:modified | rdfs:Literal typed as xsd:date or xsd:dateTime | This property contains the most recent date on which the Distribution was changed or modified. | 0..1 | schema:dateModified | significant event (P793) < reduction of the property >
point in time (P585) < date > or new property changed, depending on the outcome of the property proposal |
Agent[edit]
Mandatory properties[edit] | ||||||
| DCAT Property name | DCAT URI | Range | Usage note | Card. | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|---|
| name | foaf:name | rdfs:Literal | This property contains a name of the agent. This property can be repeated for different versions of the name (e.g. the name in different languages) | 1..n | schema:name | label |
Recommended properties[edit] | ||||||
| type | dct:type | skos:Concept | This property refers to a type of the agent that makes the Catalogue or Dataset available | 0..1 | schema:potentialAction | subject has role (P2868) |
Category[edit]
Mandatory properties[edit] | ||||||
| DCAT Property name | DCAT URI | Range | Usage note | Card. | Schema.org | Representation in Wikidata |
|---|---|---|---|---|---|---|
| preferred label | skos:prefLabel | rdfs:Literal | This property contains a preferred label of the category. This property can be repeated for parallel language versions of the label. | 1..n | schema:name | label |
Properties of the Optional Classes[edit]
[Contribution needed] Do a mapping for the remaining classes here if you need them anywhere.