PREFIX sioc: <http://rdfs.org/sioc/ns#>
SELECT *
FROM <http://demo.openlinksw.com/mw_v>
WHERE
{
?user a sioc:User .
optional{ ?user sioc:id ?id}.
optional{ ?user sioc:name ?name}.
optional{ ?user sioc:email ?email}.
optional{ ?user sioc:email_sha1 ?user_email_sha1}.
}