<http://www.fujisantrip.com/first-semester/semantics/the-development-of-language-and-meaning/the-development-of-language-and-meaning-notes/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.fujisantrip.com/first-semester/semantics/the-development-of-language-and-meaning/the-development-of-language-and-meaning-notes/>