<https://ocdn.eu/images/pulscms/MjM7MDA_/a6a157a85b9c71d2e00be1abde0ad1e1.jpg>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://businessinsider.com.pl/nieruchomosci/co-to-jest-umowa-deweloperska/zj3kyyf>