@prefix base1 : <http://id.ninebynine.org/wip/2003/test/graph1/node#> .
@prefix base2 : <http://id.ninebynine.org/wip/2003/test/graph2/node/> .
@prefix base3 : <http://id.ninebynine.org/wip/2003/test/graph3/node> .
@prefix base4 : <http://id.ninebynine.org/wip/2003/test/graph3/nodebase> .
base1:s1 a base1:o1 ; :- 
  ( [ base2:p21 base2:o2  ;  
      base2:p22 ( [ base2:p23 "lx11" ] "lx12" ) ] 
    [ base2:p24 base3:o3 ; base2:p25 "lx13" ] 
  ) .