DZT DS - 30.6.2023, extend hasMap's cardinality

POI: Extend the cardinality of schema:hasMap from 0-1 to 0+.

PointOfInterest (Sehenswürdigkeit) v1.34

1.1 Extend the cardinality of schema:hasMap from 0-1 to 0+

From now on, a POI can have more than one map URL assigned. That makes sense for cases where a POI might have a Google Map link and an OSM link. Or an additional W3W link.