<https://fiodevida.com/wp-content/uploads/2021/04/zello-5c108dcbc9e77c00016467b9.jpg>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://fiodevida.com/como-usar-o-zello-um-aplicativo-push-to-talk/>