gpx:author and gpx:PersonType

[labra]

In the XML document, there is an element gpx:author that has been converted to a gpx:author property in the ontology with range gpx:PersonType.

However, there is no gpx:PersonType declaration in the ontology. Is that on purpose? One reason is that there are other vocabularies that can represent Person like FOAF, so removing it may make sense.

Notice also that the XML document specifies also an attribute gpx:author whose value is xsd:string so it would be inconsistent with the gpx:PersonType range.

I think we could solve it by removing the rdfs:range declaration from the gpx:author property.