<https://secure.gravatar.com/avatar/dba62c6b725307566cb761d83a4c0cb8?s=96&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.milcursosgratis.com/curso-para-aprender-a-tocar-el-piano-gratis/>