> A concrete example of the difference between lean versus non lean
> graphs would be helpful; the example in RDF Semantics is confusing.
> What is the difference between lean and non lean graphs?
> Thanks in advance,
>  http://www.w3.org/TR/2004/REC-rdf-mt-20040210/ >
<eg:a> <eg:p> _:a .
<eg:a> <eg:p> _:b .
is not lean, because the second triple adds no new information.