awol:HTML
http://bblfish.net/work/atom-owl/2006-06-06/#HTML
rdfs:comment
http://www.w3.org/2000/01/rdf-schema#comment
see §3.1.1.2 of rfc 4287. The class of html strings
@en
graph:default
https://triplydb.com/sun/awol/graphs/default