Problem with Prefix and Offline RDF generation

[Nadzy]

Hi,
working with Karma v2.023, I've noticed that by making my online model and exporting triples through the interface, I get a different result than using the corrispondant published R2RML model, with the Offline generator. Here's an example:

Through Karma Web:
http://www.disit.org/km4city/resource/Abetone1405339154000 http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.disit.org/km4city/schema#WeatherReport .
http://www.disit.org/km4city/resource/Abetone14053391540001giorno http://www.disit.org/km4city/schema#uv "4"^^http://www.w3.org/2001/XMLSchema#integer .

Through Offline Generator:
http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.disit.org/km4city/schema#WeatherReport .
http://www.disit.org/km4city/schema#uv "4"^^http://www.w3.org/2001/XMLSchema#integer .

As you can see, the subject profix is missing for RDF triples generated Offline...
can anyone tell me why this happens?

thank you so much! :)