Geometry encoding as GeoJSON

[dr-shorthair]

Add asGeoJSON (datatype property) and geoJSONLiteral (datatype) to support popular geometry encoding

[dr-shorthair]

Note: this is already on the agenda for OGC GeoSPARQL revision, so we can test it more rapidly here.

[dr-shorthair]

It turns out that there is a rdf:JSON datatype introduced in the JSON-LD 1.1 revision. So I think we will only need to add asGeoJSON, which is essentially just a modified clone of asWKT etc.

However, rdf:JSON would not disambiguate between GeoJSON and Schema.org (which is usually serialized as JSON).

[mathib]

FYI, the FOG ontology has a lot of geometry format specific properties, including:

• GeoJSON-LD: https://w3id.org/fog#asGeojson-ld
• plain GeoJSON v2008: https://w3id.org/fog#asGeojson_v2008
• plain GeoJSON v2016: https://w3id.org/fog#asGeojson_v2016

Since the GeoJSON-LD is essentially RDF, the property is an owl:ObjectProperty, thus the property should link to the top node of the GeoJSON-LD file. In the two other cases, the properties are owl:DatatypeProperty and should link to a string in an RDF literal containing the entire JSON.