aspect A {
  // V1 and V2 are visitor interfaces
  declare ClassGraph cg;
  declare Strategy s1 = "from A to B";
  declare Method public final static R f(A a) s1(V1,V2); 
  declare Strategy s2 = 
    ( && "from A to B" "from * bypassing ->*,tail,* to *");
  declare Method public final static R f(A a) s2(V1); 
  declare Strategy filter = 
    "from * bypassing ->*,tail,* to *";
  declare Method public final static R f(A a) (&& filter "from X to Y")(V1); 
}