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This page details how to represent the information definition outlined in Complex and simple types using DCAT2. For example, the queryDatasets operation may return DCAT structured data.

Info
DCAT 2 is used in https://www.europeandataportal.eu/en

Table of Contents

Info

Assumptions

  • DatasetSeries is close to being a DCAT catalog
  • Dataset is the overarching concept - maps to DCAT Dataset
  • The actual file maps to DCAT Distribution
  • Everything is a resource

DCAT2 Elements


Info
titleBold rows

Property names marked in bold are where the two DCAT mappings are not harmonised. Some work needs to be done here.

Dataset

Type nameProperty nameDefinitionTypeDCAT2 (from Scott)DCAT2 (from Renato)Profile Notes (from Renato)ISO 19115:2003

Dataset


Metadata about a dataset.

https://www.w3.org/TR/vocab-dcat-2/#Class:Dataset

dcat:Dataset
DS_DataSet

id

Identification of the dataset (eg a URI)
The identification is unique within a service instance

IdentifierTypehttps://www.w3.org/TR/vocab-dcat-2/#Property:resource_identifierdct:identifierTypically a URI but could also be a string

title

Title of the dataset

string

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_title

dct:titleThe name of the datasetMD_DataIdentification.citation >
CI_Citation.title

shortDescription

Free text providing a short description of the dataset

string

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_description

dct:descriptionThe description of the datasetMD_DataIdentification.abstract)

type

Indication the main content of the dataset.

CodeDatasetType

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_type 

Note: with list coming from ICAO Annex 15

dct:type

The type of data contained in the dataset

Example: Obstacle Data Set



subject

Scope of the dataset expressed as a list of subjects .

CodeDataSubjectType https://www.w3.org/TR/vocab-dcat-2/#Property:resource_themedcat:theme (assoc)

The values will need to be represented as URIs

Use the PANS AIM data catalogue terms (from App1-1) as URLs:

http://icao.int/pans/aim/subject/airspace

updateType

Indication on how far the dataset has full content or represents an update.

CodeUpdateType (question) Needed? Agreed that updates not possible.dct:format

Example: Baseline or Delta

(Note: dct:format is an element of the wider Dublin Core metadata set)

isAiracUpdate

Indication that the dataset has been updated according to the AIRAC System.

boolean

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_keyword 

Note: with literal "AIRAC"

prov:wasGeneratedBy

Uses an instance of prov:Activity with attribute:

  • prov:used
If the dataset was generated as part of the AIRAC cycle, then the value of this attribute will be “AIRAC”.

limitationsOnUse

Free text clarifying limitations with regard to the use of the dataset.

string

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_access_rights

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_license

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_rights

odrl:hasPolicy

Uses an instance of odrl:Prohibition with attribute:

  • odrl:action
Example: “operational use”		MD_Constraints

encoding

Standard encoding of the data

CodeDataEncodingType

https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_format

Note: this on the distribution.

dct:conformsToExample value: AIXM 5.1.1

effectiveDate

Start of the validity period for the dataset

date

https://www.w3.org/TR/vocab-dcat-2/#Property:dataset_temporal

dct:temporal

Uses an instance of dct:PeriodOfTime with attributes:

  • dcat:startDate (effective date)
  • dcat:endDate (end of validity)


endValidity

End of the validity period for the dataset. When absent, no end is specified.

date https://www.w3.org/TR/vocab-dcat-2/#Property:dataset_temporaldct:temporal

Uses an instance of dct:PeriodOfTime with attributes:

  • dcat:startDate (effective date)
  • dcat:endDate (end of validity)


publicationDate

Date at which the dataset became available.

date https://www.w3.org/TR/vocab-dcat-2/#Property:resource_release_datedct:issuedISO8601 date fomat

datasetSeriesId

id of the corresponding dataseries

IdentifierType

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_qualified_relation

Note: https://dublincore.org/specifications/dublin-core/dcmi-terms/#isPartOf

dct:isPartOf

Relates the dataset to the Series



geographicalScope

The locations defining the scope of the dataset

Location https://www.w3.org/TR/vocab-dcat-2/#Property:dataset_spatialdct:spatial

Uses an instance of dct:Location with Dublin Core, vCard, and AIXM attributes:

  • dct:type (values: Airport, State, or Airspace)
  • aixm::name (name Airport and Airspace)
  • aixm:designator (designator for Airport and Airspace)
  • aixm:designatorIATA (iataCode for Airport)
  • aixm:type (type of Airspace)
  • vcard:country-name (name for State)
  • vcard:locality (territory for State)
  • vcard:postal-code (code for State)
(Note: vCard is one of the recommended DCAT vocabularies.)

datasetFileThe dataset file that the metadata concernsFilehttps://www.w3.org/TR/vocab-dcat-2/#Class:Distributiondcat:distribution

Uses an instance of a dcat:Distribution with attribute:

  • dcat:downloadURL

Example values:

   file:///donlon-airport-2020-05-05.xml

   http://example.aero/dataset/2020/05/airport/xml

DatasetSeries

Type nameProperty nameDefinitionTypeDCAT2 (from Scott)DCAT2 (from Renato)Profile Notes (from Renato)

DatasetSeries


Metadata about a dataset series.
https://www.w3.org/TR/vocab-dcat-2/#Class:Catalogdcat:Catalog

id

Identification of the dataset series (eg a URI)
The identification is unique within a service instance

IdentifierTypehttps://www.w3.org/TR/vocab-dcat-2/#Property:resource_identifierdct:identifier

title

Title of the dataset series

string https://www.w3.org/TR/vocab-dcat-2/#Property:resource_titledct:title

type

Enumeration indicating the main content of the dataset

CodeDatasetType https://www.w3.org/TR/vocab-dcat-2/#Property:resource_typedct:type

dataSubject

Data subject as defined in ICAO PANS-AIM

CodeDataSubjectType https://www.w3.org/TR/vocab-dcat-2/#Property:resource_themedcat:theme (assoc)

limitationsOnUse

Free text clarifying limitations with regard to the use of the datasets

string

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_access_rights

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_license

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_rights

odrl:hasPolicy

encoding

Standard encoding of the data

CodeDataEncodingType

https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_format

Note: this on the distribution.

dct:conformsTo

geographicalScope

The locations defining the scope of the dataset series

Location https://www.w3.org/TR/vocab-dcat-2/#Property:dataset_spatialdct:spatialLinks to the related Data Product Specification Document

DPSId

id of the corresponding data product specification

IdentifierType

https://www.w3.org/TR/vocab-dcat-2/#Property:resource_qualified_relation

Note: Need to decide on the type of relationship

dct:isReferencedBy





dcat:datasetLinks to an instance of a dataset in this series

DataProductSpecification

Type nameProperty nameDefinitionTypeDCAT (from Scott)DCAT2 (from Renato)Profile Notes (from Renato)

DataProductSpecification


Metadata about a Data Product Specification.
https://www.w3.org/TR/vocab-dcat-2/#Class:Resourcedcat:Resource

id

Identification of the data product specification
The identification is unique within a service instance

IdentifierTypehttps://www.w3.org/TR/vocab-dcat-2/#Property:resource_identifierdct:identifier

title

Title of the data product specification

string https://www.w3.org/TR/vocab-dcat-2/#Property:resource_titledct:title

dpsFileThe file that the metadata concernsFilehttps://www.w3.org/TR/vocab-dcat-2/#Class:Distributiondcat:distribution

Uses an instance of a dcat:Distribution with attribute:

  • dcat:downloadURL

Example values:

   file:///donlon-airport-DPS-2020-pdf

   http://example.aero/dataset/2020/airport.pdf





dct:typedct:type used to indicate it is a DPS document type





dct:referencesUsed to link to the DatasetSeries

File

Type nameProperty nameDefinitionTypeDCAT2 (from Scott)DCAT2 (from Renato)Profile Notes (from Renato)

File


Metadata about a file.
https://www.w3.org/TR/vocab-dcat-2/#Class:Distribution


id

Identification of the dataset file

The identification is unique within a service instance

IdentifierTypehttps://www.w3.org/TR/vocab-dcat-2/#Property:distribution_access_url


name

Name of the file

FileNameType https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_title


format

Format of the file

CodeFileFormatType https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_format


size

Size of the file in Bytes.

Number https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_size

Examples (following Renato)

Describing the Dataset Series


Code Block
{
  "@id": "http://donlon.aero/dataset/aerodrome.json",
  "@type": "dcat:Catalog",
  "dct:identifier": "aerodrome-series-2020",
  "dct:title": "Donlon Aerodrome Dataset Series 2020",
  "dct:type": "Aerodrome Dataset",
  "dcat:theme": "http://icao.int/pans/aim/subject/aerodrome",
  "dct:conformsTo": "AIXM 5.1.1",
  "dct:dataset": ["http://donlon.aero/dataset/aerodrome/2020/Jan.json",
                  "http://donlon.aero/dataset/aerodrome/2020/Mar.json",
                  "http://donlon.aero/dataset/aerodrome/2020/May.json"],
  "dct:isReferencedBy": "http://donlon.aero/dps/aerodrome.json",
  "dct:spatial": "http://donlon.aero/location/donlon.json"
}


Describing the Location


Code Block
{
  "@id": "http://donlon.aero/location/donlon.json",
  "@type": "Airport",
  "dct:spatial": [
      {
        "aixm:name": "Donlon International Airport",
        "aixm:designator": "DONDON",
        "aixm:designatorIATA": "ZZZZ"
      }]
}


Describing the May 2020 Dataset


Code Block
{
  "@id": "http://donlon.aero/dataset/aerodrome/2020/May.json",
  "@type": "dcat:Dataset",
  "dct:identifier": "aerodrome-donlon-2020-may",
  "dct:title": "Donlon Aerodrome Dataset - May 2020",
  "dct:type": "Aerodrome Dataset",
  "dcat:theme": "http://icao.int/pans/aim/subject/aerodrome",
  "dct:format": "Baseline",
  "prov:wasGeneratedBy": [
    {  
        "@type": "prov:Activity",
        "prov:used": "AIRAC" 
    }],
  "odrl:hasPolicy": [
        {
            "@type": "odrl:Prohibition", 
            "odrl:action": "operational-use" 
        }],
  "dct:conformsTo": "AIXM 5.1.1",
  "dct:temporal": [
    {
      "@type": "dct:PeriodOfTime",
      "dct:startDate": "2020-05-01",
      "dct:endDate": "2020-06-30"
    }],
  "dct:issued": "2020-04-01",
  "dct:spatial": "http://donlon.aero/location/donlon.json",
  "dct:isPartOf": "http://donlon.aero/dataset/aerodrome.json",
  "dcat:distribution": [
    {
      "@type": "dcat:Distribution",
      "dcat:downloadURL": "http://donlon.aero/dataset/aerodrome/2020/May/data.xml"
    }]
}


Describing the Data Product Specification


Code Block
{
    "@id": "http://donlon.aero/dps/aerodrome.json",
    "@type": "dcat:Resource",
    "dct:identifier": "dps-aerodrome-series-2020",
    "dct:title": "Data Product Specification: Donlon Aerodrome Dataset Series 2020",
    "dct:type": "DPS",
    "dca:references": "http://donlon.aero/dataset/aerodrome.json",
    "dcat:distribution": [
        {
          "@type": "dcat:Distribution",
          "dcat:downloadURL": "http://donlon.aero/dps/aerodrome-2020-May.pdf"
        }]
  }