<https://valiosys.com/van-de-ty-le-ban-ve-dinh-ty-le-ban-ve-autocad-tai-model-va-layout>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://valiosys.com/van-de-ty-le-ban-ve-dinh-ty-le-ban-ve-autocad-tai-model-va-layout>