SELECT ?sal, ?t, ?x  FROM  http://ilrt.org/discovery/2000/11/rss-query/jobs-rss.rdf,  http://ilrt.org/discovery/2000/11/rss-query/jobs.rss  WHERE    (job::advertises ?x ?y)    (job::salary ?y ?sal)    (job::title ?y ?t)  USING job for  http://ilrt.org/discovery/2000/11/rss-query/jobvocab.rdf#