+ "Makes a new read request with given procedure for calculating the result. The request is cached only if the current request is listened."
+ subquery :: (<ReadGraph,Proc> a) -> <ReadGraph,Proc> a
+ "Makes a new read request with given procedure for calculating the result. The request is always cached."
+ subqueryC :: (<ReadGraph,Proc> a) -> <ReadGraph,Proc> a
+