select ?z, ?y, ?x 
from http://example.com,  http://exampleagain.com 
where (?z http://jdsfhgjfhk ddd::bla)
 (?z http://jdahgfkjasdhgkj ?y)
using ddd for http://asdgjkasjdgklasj
 aaa for http://asdgjfadglad/asdfdja