awol:length
http://bblfish.net/work/atom-owl/2006-06-06/#length
rdfs:comment
http://www.w3.org/2000/01/rdf-schema#comment
see §4.2.7.6 of rfc 4287. The length in bytes of the representation.
@en
graph:default
https://triplydb.com/sun/awol/graphs/default