SELECT ?signer, ?signerMail, ?signee, ?signeeMail, ?hex  
FROM http://rdfweb.org/~pldab/rdfweb/danbri.wot.rdf
WHERE 
(wot::identity ?pk ?id)
(foaf::name ?id ?signee)
(foaf::mbox ?id ?signeeMail)
(wot::signed ?id ?e)
(foaf::name ?e ?signer)
(foaf::mbox ?e ?signerMail)
(wot::signerLongHexID ?e ?hex) 
USING wot FOR http://xmlns.com/wot/0.1/
     foaf FOR http://xmlns.com/foaf/0.1/