<https://jenyay.net/blog/2010/08/03/magicplot-eshhe-odna-programma-dlya-risovaniya-grafikov/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://jenyay.net/blog/2010/08/03/magicplot-eshhe-odna-programma-dlya-risovaniya-grafikov/>