Introduction

Excerpt
This page details how to represent the information definition outlined in Data Model using fields from ISO 19115 and DCAT. 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 profiles 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

InfoA 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.

lists metadata profiles that can be used by an implementer to represent the Data Model.

Table of Contents

Profiles

	Based on
1	ISO 19115
2	DCAT3	https://airservicesaustralia.github.io/dcat-profile/

Mappings

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
general notes. This column also contains ideas for change requests.

Dataset

Type name

Property name

Definition

Type

ISO 19115:2003

DCAT3 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

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.

Info

title	Change proposal - draft only

update definition to one used in ICAO: Identifiable collection of data (ISO 19101*).

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

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

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

Info

title	Change proposal - draft only

rename property name to "description".

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)

Can this be bundled into an overall classification scheme?

Note: with list coming from ICAO Annex 15

Info

title	Change proposal - draft only

rename property name to "form".

Update definition to "the form of the data set."

Note: The different forms of ICAO data sets are listed in ICAO Annex 15 5.3.1.1:

a) AIP data set;
b) terrain data sets;
c) obstacle data sets;
d) aerodrome mapping data sets; and
e) instrument flight procedure data sets.

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)

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)

Info

title	Change proposal - draft only

rename property name to "timeSliceType".

Update definition to "the type of timeslice contained in of the data 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)

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)

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

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

Info

title	Change proposal - draft only

rename property name to "confromance".

Update definition to "the standard to which the data conforms."

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

Consider renaming to startValidity to be consistent.

Info

title	Change proposal - draft only

rename property name to "startValidity".

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

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

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

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)

Info

title	Change proposal - draft only

rename property name to "geographicalExtent".

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)

DatasetSeries

Type name

Property name

Definition

Type

ISO 19115:2003

DCAT3 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)

Info

title	Change proposal - draft only

update definition to one used in ICAO: Collection of data sets sharing the same product specification (ISO 19115*).

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

title

Title of the dataset series

string

MD_DataIdentification.citation.CI_Citation.title

dct:title

The Title of the Dataset Series

dct:description

A Description of the Dataset Series

type

Enumeration indicating the main content of the dataset

CodeDatasetType

MD_DataIdentification.descriptiveKeywords.MD_Keywords.keyword

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)

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)

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

encoding

Standard encoding of the data

CodeDataEncodingType

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)

DPSId

id of the corresponding data product specification

IdentifierType

dct:isReferencedBy

Links (to and from) the Data Product Specification that describes this series

distribution(?)

dct:dataset

Links (to and from) the individual Datasets that make up this series

DataProductSpecification

Type name	Property name	Definition	Type	ISO 19115:2003	DCAT3 equivalent
DataProductSpecification		Metadata about a Data Product Specification.			dcat: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
	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
	dpsFile	The file that the metadata concerns	File		dcat:distribution Links to the availability of the DPS (as a file)
				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: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

Data File

Type name	Property name	Definition	Type	DCAT3 equivalent	General notes
File		Metadata about a file.		dcat:Distribution https://www.w3.org/TR/vocab-dcat-3/#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	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
	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)
	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

Examples (using DCAT)

Describing the Dataset Series

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 Dataset

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	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 63	New Version 64
Changes made by	WILSON Scott	WILSON Scott
Saved on	2021 Jun 04	2021 Jun 04

Page Comparison

Versions Compared

Key

Introduction

Purpose

Mappings

Profiles

Mappings

Dataset

DatasetSeries

DataProductSpecification

Data File

Examples (using DCAT)

Describing the Dataset Series

Describing the Dataset

Describing the Data Product Specification