<https://www.itpro.com/security/cyber-security/361012/what-is-a-web-filter>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebPage>
<https://www.itpro.com/security/cyber-security/361012/what-is-a-web-filter>