title: Where can a list of all existing HTML meta tags be found? (DUBLIN CORE, OPEN GRAPH etc)
body: <p>I am investigating the use and consumption of HTML meta tags.</p>
  
  <p>Such as those defined by Dublin Core, Open Graph etc..</p>
  
  <p>I am struggling to locate a definitive list of all possible meta tag schemas and for each schema a list of all possible tags.</p>
  
  <p>for example where can I find a list of all possible meta tags that start "<code>citation_</code>"?</p>