The data catalog vocabulary

A site or end-point that gives access to the distribution of the dataset.

A URL of a resource that gives access to a distribution of the dataset. E.g. landing page, feed, SPARQL endpoint. Use for all cases except a simple download link, in which case downloadURL is preferred.

If the distribution(s) are accessible only through a landing page (i.e. direct download URLs are not known), then the landing page link should be duplicated as accessURL on a distribution.

A catalog whose contents are of interest in the context of this catalog.

The compression format of the distribution in which the data is contained in a compressed form, e.g. to reduce the size of the downloadable file.

This property is to be used when the files in the distribution are compressed, e.g. in a ZIP file. The format SHOULD be expressed using a media type as defined by IANA media types registry https://www.iana.org/assignments/media-types/, if available.

Relevant contact information for the catalogued resource. Use of vCard is recommended.

A collection of data that is listed in the catalog.

An available distribution of the dataset.

The URL of the downloadable file in a given format. E.g. CSV file or RDF file. The format is indicated by the distribution's dct:format and/or dcat:mediaType.

dcat:downloadURL SHOULD be used for the address at which this distribution is available directly, typically through a HTTP Get request.

A description of the service end-point, including its operations, parameters etc.

An endpoint description may be expressed in a machine-readable form, such as an OpenAPI (Swagger) description, an OGC GetCapabilities response, a SPARQL Service Description, an OpenSearch or WSDL document, a Hydra API description, else in text or some other informal mode if a formal representation is not possible.

The root location or primary endpoint of the service (a web-resolvable IRI).

The function of an entity or agent with respect to another entity or resource.

May be used in a qualified-relation to specify the role of an Entity with respect to another Entity. It is recommended that the value be taken from a controlled vocabulary of entity roles such as: ISO 19115 DS_AssociationTypeCode http://registry.it.csiro.au/def/isotc211/DS_AssociationTypeCode; IANA Registry of Link Relations https://www.iana.org/assignments/link-relation; DataCite metadata schema; MARC relators https://id.loc.gov/vocabulary/relators.

A Web page that can be navigated to in a Web browser to gain access to the catalog, a dataset, its distributions and/or additional information.

If the distribution(s) are accessible only through a landing page (i.e. direct download URLs are not known), then the landing page link should be duplicated as accessURL on a distribution.

The media type of the distribution as defined by IANA.

This property SHOULD be used when the media type of the distribution is defined in the IANA media types registry https://www.iana.org/assignments/media-types/, otherwise dct:format MAY be used with different values.

The package format of the distribution in which one or more data files are grouped together, e.g. to enable a set of related files to be downloaded together.

This property to be used when the files in the distribution are packaged, e.g. in a TAR file, a Frictionless Data Package or a Bagit file. The format SHOULD be expressed using a media type as defined by IANA media types registry https://www.iana.org/assignments/media-types/, if available.

Link to a description of a relationship with another resource.

Used to link to another resource where the nature of the relationship is known but does not match one of the standard Dublin Core properties (dct:hasPart, dct:isPartOf, dct:conformsTo, dct:isFormatOf, dct:hasFormat, dct:isVersionOf, dct:hasVersion, dct:replaces, dct:isReplacedBy, dct:references, dct:isReferencedBy, dct:requires, dct:isRequiredBy) or PROV-O properties (prov:wasDerivedFrom, prov:wasInfluencedBy, prov:wasQuotedFrom, prov:wasRevisionOf, prov:hadPrimarySource, prov:alternateOf, prov:specializationOf).

A record describing the registration of a single dataset or data service that is part of the catalog.

A collection of data that this DataService can distribute.

A site or endpoint that is listed in the catalog.

A main category of the resource. A resource can have multiple themes.

The set of skos:Concepts used to categorize the resources are organized in a skos:ConceptScheme describing all the categories and their relations in the catalog.

The knowledge organization system (KOS) used to classify catalog's datasets.

It is recommended that the taxonomy is organized in a skos:ConceptScheme, skos:Collection, owl:Ontology or similar, which allows each member to be denoted by an IRI and published as linked-data.

This axiom needed so that Protege loads DCAT2 without errors.

This axiom needed so that Protege loads DCAT2 without errors.

The geographic bounding box of a resource.

The range of this property is intentionally generic, with the purpose of allowing different geometry encodings. E.g., the geometry could be encoded with as WKT (geosparql:wktLiteral [GeoSPARQL]) or [GML] (geosparql:asGML [GeoSPARQL]).

The size of a distribution in bytes.

The size in bytes can be approximated when the precise size is not known. The literal value of dcat:byteSize should by typed as xsd:decimal.

The geographic center (centroid) of a resource.

The range of this property is intentionally generic, with the purpose of allowing different geometry encodings. E.g., the geometry could be encoded with as WKT (geosparql:wktLiteral [GeoSPARQL]) or [GML] (geosparql:asGML [GeoSPARQL]).

The end of the period.

The range of this property is intentionally generic, with the purpose of allowing different level of temporal precision for specifying the end of a period. E.g., it can be expressed with a date (xsd:date), a date and time (xsd:dateTime), or a year (xsd:gYear).

A keyword or tag describing a resource.

If the dataset is an image or grid this should correspond to the spacing of items. For other kinds of spatial dataset, this property will usually indicate the smallest distance between items in the dataset.

The start of the period

The range of this property is intentionally generic, with the purpose of allowing different level of temporal precision for specifying the start of a period. E.g., it can be expressed with a date (xsd:date), a date and time (xsd:dateTime), or a year (xsd:gYear).

minimum time period resolvable in a dataset.

If the dataset is a time-series this should correspond to the spacing of items in the series. For other kinds of dataset, this property will usually indicate the smallest time difference between items in the dataset.