@prefix : <http://cwmTest/>.

        @prefix log: <http://www.w3.org/2000/10/swap/log#>.
	  @prefix math: <http://www.w3.org/2000/10/swap/math#> .
	  @prefix string: <http://www.w3.org/2000/10/swap/string#> .


         { ?x :hasValue ?valX. ?y :hasValue ?valY.
  		(?valX ?valY) math:sum ?z.
	  ("http://"  ?x " + " ?y " = " ?z ) string:concatenation ?s.
	} => { ?x a ?s }.


:t1 :hasValue 3. 
:t2 :hasValue 4.