awol:Content
http://bblfish.net/work/atom-owl/2006-06-06/#Content
rdfs:comment
http://www.w3.org/2000/01/rdf-schema#comment
see §4.1.3 in rfc 4287 One way ...... type, content-lenght, etc... .
@en
graph:default
https://triplydb.com/sun/awol/graphs/default