<https://secure.gravatar.com/avatar/7042fb216b6cf5ef7c27cb271315a2cc?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tiengtrung.com/phan-mem/cai-bo-go-tieng-trung-vao-dien-thoai.html>