How should dct:spatial and dct:Location be used? Switch to the latest release
Issue
The use of the MDR vs. Geonames vs. the Core Location Vocabulary URIs seems to be confusing.
The discussion on the issue is available here.
Current situation
DCAT-AP version 1.1 lists a number of controlled vocabularies for named places but it is not the only way to express spatial coverage.
Recommendation
Rationale
Spatial coverage can be expressed in different ways, such as with named places or spatial regions as stated by the usage note of the DCAT-AP specification version 1.1. Both ways can be represented by using controlled vocabularies or geographic coordinates. In the first case (i.e. named places), the specification lists different controlled vocabularies: MDR Continents Named Authority List, MDR Countries Named Authority List, MDR Places Named Authority List, Geonames. In the second case (i.e. geographic coordinates), the specification recommends to use the Core Location Vocabulary by following the guidance described in the GeoDCAT-AP specification. |
Example
Based on an example of the GeoDCAT-AP specification on how to specify the spatial coverage.
[] dct:spatial [ a dct:Location ; locn:geometry "POLYGON((-10.58 70.09,34.59 70.09,34.59 34.56,-10.58 34.56, -10.58 70.09))"^^gsp:wktLiteral ; locn:geometry “<gml:Envelope srsName=\http://www/opengis.net/def/crs/DGC/1.3/CRS84\> <gml:lowerCorner>34.56 -10.58</gml:lowerCorner> <gml:upperCorner>70.09 34.59</gml:upperCorner> </gml:Envelope> "^^gsp:gmlLiteral ] ; locn:geometry "{\"type\":\"Polygon\",\"crs\":{\"type\":\"name\",\"properties\":{\"name\":\"ur n:ogc:def:crs:OGC:1.3:CRS84\"}}, \"coordinates\":[[[- 10.58,70.09],[34.59,70.09],[34.59,34.56],[-10.58,34.56],[-10.58,70.09]]] }"^^ https://www.iana.org/assignments/media-types/application/vnd.geo+json ]. |