All properties in model.owl.ttl are of type owl:ObjectProperty. This causes problem in ontop because the reasoner
expects ObjectProperties to relate to objects, not Literals (xsd:string, xsd:int, xsd:date, xsd:dateTime, ...). One example is core:acquisition_date which relates to strings such as "2025-02-06^^xsd:date" and should therefore be a DataProperty, not an ObjectProperty. The same holds for numerous other properties.