<https://www.aergo.io/news/aergo-merkle-bridge-what-else-is-needed-for-nft/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.aergo.io/news/aergo-merkle-bridge-what-else-is-needed-for-nft/>