<https://forum.simrail.eu/topic/3180-ed250trzy-r%C3%B3%C5%BCne-oznaczenia-jednego-sk%C5%82adu/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.simrail.eu/topic/3180-ed250trzy-r%C3%B3%C5%BCne-oznaczenia-jednego-sk%C5%82adu/>