Default namespace undefined in gpx.n3

[labra]

I noticed that the default namespace is undefined in the gpx.n3 file. It seems that it is used for the properties :comment, :label and :range so I think it should point to the rdfs namespace.

Is that so? Or maybe there is another reason to keep it undefined?

The solution could be to include the line:

@prefix : <http://www.w3.org/2000/01/rdf-schema#> .

but before creating a PR for that, I prefer to ask in case there is something I am missing.