Any geometry:
Points: one of the above, or:
The Identifier class represents any identifier issued by any authority, whether a government agency or not. It captures the identifier itself and details of the issuing authority, the date on which the identifier was issued and so on.
This class is based on the UN/CEFACT Identifier complex type defined in See Section 5.8 of Core Components Data Type Catalogue Version 3.1
The various conceptual properties can be fulfilled as follows:
The Conceptual Model includes a 'Code' datatype that is used for the types of relation and membership properties. This is expressed using the SKOS vocabulary with a particular 'code' usually being a skos:Concept that is part of a scheme. The intention is that the skos:Concepts class be used as follows;
A geographic name is a proper noun applied to a spatial object. Taking the example used in the INSPIRE document (page 18), the following are all valid geographic names for the Greek capital:
For INSPIRE-conformant data, provide the metadata for the geographic name using a skos:Concept as a datatype.
Depending on how a geometry is encoded (see usage note of the locn:Geometry class), the range of this property may be either a literal (e.g., WKT - string literal -, GML, KML - XML literal) or a geometry class, as those defined in the OGC's GeoSPARQL specification, in the W3C's Basic Geo (WGS84 lat/long) vocabulary, and at schema.org, or even the GeoHash URI references.
The following are examples of equivalent statements using different geometry encodings:
WKT (GeoSPARQL)
<ex:a> locn:geometry "<http://www.opengis.net/def/crs/OGC/1.3/CRS84> Point(-0.001475 51.477811)"^^ogc:WKTLiteral .
GML
<ex:a> locn:geometry "<gml:Point srsName='http://www.opengis.net/def/crs/OGC/1.3/CRS84'> <gml:coordinates>-0.001475, 51.477811</gml:coordinates></gml:Point>"^^ogc:GMLLiteral .
RDF+WKT (GeoSPARQL)
<ex:a> locn:geometry [ a ogc:Point; ogc:asWKT "<http://www.opengis.net/def/crs/OGC/1.3/CRS84> Point(-0.001475 51.477811)"^^ogc:WKTLiteral ] .
RDF+GML (GeoSPARQL)
<ex:a> locn:geometry [ a ogc:Point; ogc:asGML "<gml:Point srsName='http://www.opengis.net/def/crs/OGC/1.3/CRS84'> <gml:coordinates>-0.001475, 51.477811</gml:coordinates></gml:Point>"^^ogc:GMLLiteral ] .
RDF (WGS84 lat/long)
<ex:a> locn:geometry [ a geo:Point; geo:lat "51.477811"; geo:long "-0.001475" ] .
RDF (schema.org)
<ex:a> locn:geometry [ a schema:GeoCoordinates; schema:latitude "51.477811"; schema:longitude "-0.001475" ] .
URI reference (GeoHash)
<ex:a> locn:geometry <http://geohash.org/gcpuzgnzvxkp> .