<https://www.delphitools.info/2013/06/17/string-unification/600px-calabi-yau/#main#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.delphitools.info/2013/06/17/string-unification/600px-calabi-yau/>