Introduction

Excerpt
This page details how to represent the information definition outlined in Complex and simple types using fields from ISO 19115 and DCAT2. For example, the queryDatasets operation may return DCAT structured data.

Info
DCAT2 is used in https://www.europeandataportal.eu/en DCAT3 is currently under development. It can be found at: https://www.w3.org/TR/vocab-dcat-3/

Table of Contents

Purpose

The representations are created:

in order to improve the current information definition. It may be, for example, possible to change the terms and definitions to be more in line with accepted international standards.
- once this has happened, the updated terms and definitions can be used to write requirements on data set catalogues.
in order to allow implementers using different vocabularies to map to the appropriate term.

Mappings

Info

A general mapping from ISO 19115 to DCAT is available at https://semiceu.github.io/GeoDCAT-AP/releases/#rdf-syntax-bindings-for-inspire-and-iso19115-metadata-elements. The mappings below make use of this where possible.

Info

title	DCAT2 mapping assumptions

DatasetSeries is close to being a DCAT catalog (note, that this has changed in DCAT3)

Dataset is the overarching concept - maps to DCAT Dataset

The actual file maps to DCAT Distribution

Everything is a resource

Info

title	ISO 19115 versions

The mappings use ISO 19115:2003. There are more recent versions of the standard available e.g. 19115:2014. This doesn't affect datasets too much. Mapping to the same fields.

Each table includes:

the current information definition
the ISO 19115:2003 field
the DCAT3 equivalent
the DCAT2 equivalent
general notes. This column also contains ideas for change requests.

Dataset

Type name

Property name

Definition

Type

ISO 19115:2003

DCAT3 equivalent

DCAT2 equivalent

General notes

Dataset

Metadata about a dataset.

MD_Metadata

describing resource of type DS_DataSet

dcat:Dataset

https://www.w3.org/TR/vocab-dcat-3/#Class:Dataset

dcat:Dataset

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

Info

title	Change proposal - draft only

Remodel dataset, dataset series, dps to show thay are different types of resources. In reality, the metadata about them is very similar.

id

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

IdentifierType

MD_DataIdentification.citation.CI_Citation.identifier

@id

The Identifier of the Dataset

dct:identifier

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

Typically a URI but could also be a string

Info

title	Change proposal - draft only

rename property name to "identifier".

Update definition to "Special unique identifier permanently assigned to an entity." (AIRM)

title

Title of the dataset

string

MD_DataIdentification.citation.CI_Citation.title

dct:title

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_title

The Title of the Dataset

dct:title

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

The name of the dataset

Info

title	Change proposal - draft only

Update definition to "name by which the cited resource is known." (ISO 19115)

shortDescription

Free text providing a short description of the dataset

string

MD_DataIdentification.abstract

dct:description

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_description

A Description of the Dataset

dct:description

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

The description of the dataset

Info

title	Change proposal - draft only

rename property name to "abstract".

Update definition to "brief narrative summary of the content of the resource(s)." (ISO 19115)

type

Indication the main content of the dataset.

CodeDatasetType

MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword

dct:type

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_type

The (release) Type of the Dataset (using identified vocabulary terms)

dct:type

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

The type of data contained in the dataset
Example: Obstacle Data Set

Can this be bundled into an overall classification scheme?

Note: with list coming from ICAO Annex 15

subject

Scope of the dataset expressed as a list of subjects .

CodeDataSubjectType

MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword

dcat:theme

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_theme

The subject theme of the Dataset (using identified vocabulary terms)

dcat:theme (assoc)

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

The values will need to be represented as URIs

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

The list of possible terms should be registered/published in order to allow URLs to be used. Recommendation is to use a controlled vocabulary.

Consider using AIRM identifiers for resources e.g.

dcat:theme": "urn:aero:airm:1.0.0:ContextualModel:ATMBusinessTerms:Aerodrome"

updateType

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

CodeUpdateType

MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword

The collection method of the Dataset (using identified vocabulary terms)

dct:format

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

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

Update is the wrong word. Datasets are not updated. Think of a better word to reflect the temporality model

Note

It is not clear if this is the best DCAT2 field. The semantics do not match easily.

We could consider e.g. prov:wasDerivedFrom

"Release Type" makes more sense. A request has been raised to the DCAT3 WG https://github.com/w3c/dxwg/issues/1289

isAiracUpdate

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

boolean

MD_DataIdentification.extent.EX_Extent.description

Note: this is the same approach as used in DS-META-004 - Indication that this is an AIRAC update

dct:accrualMethod

The encoding conformance of the Dataset (using identified vocabulary terms)

prov:wasGeneratedBy

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

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”.

The definition of this term makes it clear that it is a statement of the process used to update the data. That is why prov is used.

Consider using AIRM identifiers for resources e.g.

prov:wasGeneratedBy": "urn:aero:airm:1.0.0:ContextualModel:ATMBusinessTerms:AIRAC"

limitationsOnUse

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

string

MD_DataIdentification.resourceConstraints.MD_Constraints.useLimitations

Can also use e.g. MD_LegalConstraints, MD_SecurityConstraints

Note: this is the same approach as used in DS-META-005 - Limitations on use.

odrl:hasPolicy

The policy (usage rules) of the Dataset (using vocabulary model)

odrl:hasPolicy

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

Uses an instance of odrl:Prohibition with attribute:

odrl:action

Example: “operational use”

Need to check what is meant here – policy is the most generic approach

encoding

Standard encoding of the data

CodeDataEncodingType

DQ_DataQuality.report.DQ_Eelement.result.DQ_ConformanceResult.specification

dct:conformsTo

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_conforms_to

dct:conformsTo

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

Example value: AIXM 5.1.1

ISO mapping is long-winded. Is it correct to treat it this way?

effectiveDate

Start of the validity period for the dataset

date

MD_DataIdentification.extent.EX_Extent.temporalElement.EX_TemporalExtent.extent

Note: this is the same approach as used in DS-META-003 - Validity of the data set

dct:temporal.dct:startDate

https://www.w3.org/TR/vocab-dcat-3/#Property:dataset_temporal

The temporal effective dates of the Datset

dct:temporal

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

Uses an instance of dct:PeriodOfTime with attributes:

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

Consider renaming to startValidity to be consistent.

endValidity

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

date

MD_DataIdentification.extent.EX_Extent.temporalElement.EX_TemporalExtent.extent

Note: this is the same approach as used in DS-META-003 - Validity of the data set

dct:temporal.dct:endDate

https://www.w3.org/TR/vocab-dcat-3/#Property:dataset_temporal

dct:temporal

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

MD_DataIdentification.citation.CI_Citation.date

Note: this is the same approach as used in DS-META-002 - Date and time when provided.

dct:issued

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_release_date

dct:issued

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

ISO8601 date fomat

datasetSeriesId

id of the corresponding dataseries

IdentifierType

MD_DataIdentification.citation.CI_Citation.series

dct:isPartOf

https://www.w3.org/TR/vocab-dcat-3/#Property:resource_qualified_relation

Links (to and from) the Datasets Series

dct:isPartOf

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

Note: https://dublincore.org/specifications/dublin-core/dcmi-terms/#isPartOf
Relates the dataset to the Series

geographicalScope

The locations defining the scope of the dataset

Location

MD_DataIdentification.extent.EX_Extent.geographicalElement.EX_GeographicalExtent

Note: this is the same approach as used in DS-META-007 - Geographical extent of the data set

dct:spatial

https://www.w3.org/TR/vocab-dcat-3/#Property:dataset_spatial

The spatial location of the Dataset Series (using vocabulary model)

dct:spatial

https://www.w3.org/TR/vocab-dcat-2/#Property:dataset_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 of State)
vcard:region (Name of Jurisdiction/Territory within State)
vcard:locality (Name on City/Town within Jurisdiction/Territory)
vcard:postal-code (Postal code for City/Town)

(Note: vCard is one of the recommended DCAT vocabularies.)

location – look into vcard

Location should be based on AIRM/AIXM model

datasetFile

The dataset file that the metadata concerns

File

MD_Distribution

dcat:distribution

https://www.w3.org/TR/vocab-dcat-3/#Property:dataset_distribution

Links to the availability of the dataset (as file and/or data service)

dcat:distribution

https://www.w3.org/TR/vocab-dcat-2/#Class: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 name	Property name	Definition	Type	ISO 19115:2003	DCAT3 equivalent	DCAT2 equivalent	General notes
DatasetSeries		Metadata about a dataset series.			dcat:DatasetSeries https://www.w3.org/TR/vocab-dcat-3/#dataset-series (exact details under discussion)	dcat:Catalog https://www.w3.org/TR/vocab-dcat-2/#Class:Catalog
	id	Identification of the dataset series (eg a URI) The identification is unique within a service instance	IdentifierType	MD_DataIdentification.citation.CI_Citation.identifier	@id The Identifier of the Dataset Series	dct:identifier https://www.w3.org/TR/vocab-dcat-2/#Property:resource_identifier
	title	Title of the dataset series	string	MD_DataIdentification.citation.CI_Citation.title	dct:title The Title of the Dataset Series	dct:title https://www.w3.org/TR/vocab-dcat-2/#Property:resource_title
					dct:description A Description of the Dataset Series
	type	Enumeration indicating the main content of the dataset	CodeDatasetType	MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword		dct:type https://www.w3.org/TR/vocab-dcat-2/#Property:resource_type
	dataSubject	Data subject as defined in ICAO PANS-AIM	CodeDataSubjectType	MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword	dcat:theme The subject theme of the Dataset Series (using identified vocabulary terms)	dcat:theme (assoc) https://www.w3.org/TR/vocab-dcat-2/#Property:resource_theme
	limitationsOnUse	Free text clarifying limitations with regard to the use of the datasets	string	MD_DataIdentification.resourceConstraints.MD_Constraints.useLimitations Can also use e.g. MD_LegalConstraints, MD_SecurityConstraints	The policy (usage rules) of the Dataset Series (using vocabulary model)	odrl:hasPolicy 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	need to check what is meant here – policy is the most generic approach
	encoding	Standard encoding of the data	CodeDataEncodingType			dct:conformsTo https://www.w3.org/TR/vocab-dcat-2/#Property:resource_conforms_to
	geographicalScope	The locations defining the scope of the dataset series	Location	MD_DataIdentification.extent.EX_Extent.geographicalElement.EX_GeographicalExtent	dct:spatial The spatial location of the Dataset Series (using vocabulary model)	dct:spatial https://www.w3.org/TR/vocab-dcat-2/#Property:dataset_spatial Links to the related Data Product Specification Document
	DPSId	id of the corresponding data product specification	IdentifierType		dct:isReferencedBy Links (to and from) the Data Product Specification that describes this series	dct:isReferencedBy https://www.w3.org/TR/vocab-dcat-2/#Property:resource_qualified_relation Note: Need to decide on the type of relationship
				distribution(?)	dct:dataset Links (to and from) the individual Datasets that make up this series	dcat:dataset Links to an instance of a dataset in this series

DataProductSpecification

Type name	Property name	Definition	Type	ISO 19115:2003	DCAT3 equivalent	DCAT2 equivalent
DataProductSpecification		Metadata about a Data Product Specification.			dcat:Resource	dcat:Resource https://www.w3.org/TR/vocab-dcat-2/#Class:Resource
	id	Identification of the data product specification The identification is unique within a service instance	IdentifierType	MD_DataIdentification.citation.CI_Citation.identifier	@id The Identifier of the DPS	dct:identifier https://www.w3.org/TR/vocab-dcat-2/#Property:resource_identifier
	title	Title of the data product specification	string	MD_DataIdentification.citation.CI_Citation.title	dct:title https://www.w3.org/TR/vocab-dcat-3/#Property:resource_title The Title of the DPS	dct:title https://www.w3.org/TR/vocab-dcat-2/#Property:resource_title
	dpsFile	The file that the metadata concerns	File		dcat:distribution Links to the availability of the DPS (as a file)	dcat:distribution https://www.w3.org/TR/vocab-dcat-2/#Class: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
				MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword	dct:type https://www.w3.org/TR/vocab-dcat-3/#Property:resource_type The type of document (using identified vocabulary terms)	dct:type dct:type used to indicate it is a DPS document type
					dct:references https://www.w3.org/TR/vocab-dcat-3/#Property:resource_relation https://dublincore.org/specifications/dublin-core/dcmi-terms/#references Links (to and from) the Dataset Series that the DPS describes	dct:references Used to link to the DatasetSeries

Data File

Type name	Property name	Definition	Type	DCAT3 equivalent	DCAT2 equivalent	General notes
File		Metadata about a file.		dcat:Distribution https://www.w3.org/TR/vocab-dcat-3/#Class:Distribution	https://www.w3.org/TR/vocab-dcat-2/#Class:Distribution
	id	Identification of the dataset file The identification is unique within a service instance	IdentifierType	dcat:accessURL https://www.w3.org/TR/vocab-dcat-3/#Property:distribution_access_url The URL of the document/dataset	https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_access_url	This is not the ID of the file, but the landing page, feed, SPARQL endpoint (etc)
	name	Name of the file	FileNameType	dct:title https://www.w3.org/TR/vocab-dcat-3/#Property:distribution_title	https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_title
	format	Format of the file	CodeFileFormatType	dct:format https://www.w3.org/TR/vocab-dcat-3/#Property:distribution_format The media type of document/dataset (using identified vocabulary terms)	https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_format
	size	Size of the file in Bytes.	Number	dcat:byteSize https://www.w3.org/TR/vocab-dcat-3/#Property:distribution_size The size (in bytes) of the document/dataset	https://www.w3.org/TR/vocab-dcat-2/#Property:distribution_size
					dcat:downloadURL

Examples (using DCAT)

Describing the Dataset Series

Code Block

title	DCAT2

{
  "@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"
}

Code Block

title	DCAT3

{
  "@id": "http://donlon.aero/series/aerodrome/",
  "@type": "dcat:DatasetSeries",
  "dct:title": "Donlon Aerodrome Dataset Series",
  "dct:description": "Aerodrome datasets for Donlon ...",
  "dcat:theme": "http://vocab.icao.aero/feature/aerodrome",
  "dct:spatial": {
        "@type": "http://vocab.icao.aero/feature/aerodrome",
        "aixm:name": "Donlon International Airport",
        "aixm:designator": "DONDON",
           " aixm:designatorIATA": "ZZZZ" },
  "dct:dataset": ["http://donlon.aero/series/aerodrome/2021/Jan", 
                          "http://donlon.aero/series/aerodrome/2021/Feb",
                          "http://donlon.aero/series/aerodrome/2021/Mar"],
  "dct:isPartOf": "http://donlon.aero/data-catalogue",
  "dct:isReferencedBy": "http://donlon.aero/product/aerodrome"
}

Describing the Location

Code Block

title	DCAT2

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

Describing the Dataset

Code Block

title	DCAT2

{
  "@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"
    }]
}

Code Block

title	DCAT3

{
  "@id": "http://donlon.aero/series/aerodrome/2021/Jan",
  "@type": "dcat:Dataset",
  "dct:title": "Donlon Aerodrome Dataset - January 2021",
  "dct:type": "http://vocab.icao.aero/info/baseline",
  "dcat:theme": "http://vocab.icao.aero/feature/aerodrome",
  "dct:accrualMethod": "http://vocab.icao.aero/info/airac",
  "dct:conformsTo": "http://vocab.icao.aero/info/aixm/511",
  "odrl:hasPolicy": { 
        "@type": "odrl:Prohibition",  
        "odrl:action": "http://vocab.icao.aero/policy/operational-use"  },
  "dct:issued": "2020-12-31",
  "dct:temporal": {
      "@type": "dct:PeriodOfTime", 
      "dct:startDate": "2021-01-01",
      "dct:endDate": "2021-01-30" },
  "dcat:distribution": {
      "@type": "dcat:Distribution", 
      "dcat:downloadURL": "http://donlon.aero/series/aerodrome/2021/Jan/data.xml",
      "dcat:mediaType": "https://www.iana.org/assignments/media-types/application/gml+xml",
      "dct:size": "34254" },
  "dcat:service": {
      "@type": "dcat:DataService",
      "dcat:endpointURL": "http://donlon.aero/api/aerodrome/",
      "dcat:compressFormat": "https://www.iana.org/assignments/media-types/application/gzip" },
  "dct:isPartOf": "http://donlon.aero/series/aerodrome/"
}

Describing the Data Product Specification

Code Block

title	DCAT2

{
    "@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"
        }]
  }

Code Block

title	DCAT3

{
    "@id": "http://donlon.aero/product/aerodrome",
    "@type": "dcat:Resource",
    "dct:title": "Data Product Specification: Donlon Aerodrome Dataset Series ",
    "dct:type": "http://vocab.icao.aero/info/data-product-spec",
    "dct:references": "http://donlon.aero/series/aerodrome/",
    "dcat:distribution": {
          "@type": "dcat:Distribution", 
          "dcat:downloadURL": "http://donlon.aero/dps/aerodrome-dps.pdf",
          "dcat:mediaType": "https://www.iana.org/assignments/media-types/application/pdf"
        }
}

Version	Old Version 58	New Version 59
Changes made by	WILSON Scott	WILSON Scott
Saved on	2021 Apr 12	2021 Apr 12

Page Comparison

Versions Compared

Key

Introduction

Purpose

Mappings

Dataset

DatasetSeries

DataProductSpecification

Data File

Examples (using DCAT)

Describing the Dataset Series

Describing the Location

Describing the Dataset

Describing the Data Product Specification