<https://pcgameforum.com/threads/build-your-own-nft-gaming-platform-like-polkawar-game.1472/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pcgameforum.com/threads/build-your-own-nft-gaming-platform-like-polkawar-game.1472/>