<https://en.vietnamplus.vn/more-efforts-to-be-made-to-optimize-ovs-resources/146174.vnp>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://en.vietnamplus.vn/more-efforts-to-be-made-to-optimize-ovs-resources/146174.vnp>