SELECT 	?x, ?y, ?title1, ?title2, ?abstract1, ?abstract2, ?lastmod
FROM	
	<http://rdfweb.org/people/danbri/2001/06/dcarch-test/relations/features_fix.rdf>,
	<http://rdfweb.org/people/danbri/2001/06/dcarch-test/relations/humans_fix.rdf>
WHERE
	(?x, dc:title, ?title1),
	(?y, dc:title, ?title2),
	(?x, dcq:abstract, ?abstract1),
	(?y, dcq:abstract, ?abstract2),
	(?x, dcq:references, ?y),
	(?y, dcq:modified, ?m),
	(?m, rdf:value, ?lastmod)
USING 	dcq for <http://dublincore.org/2000/03/13/dcq#>,
	rdf for <http://www.w3.org/1999/02/22-rdf-syntax-ns#>,
	vcard for <http://www.w3.org/2001/vcard-rdf/3.0#>,
	dc for <http://purl.org/dc/elements/1.1/>