+ "-C", Set compose,
+ " compose queries: each query is applied to the results of the \
+previous one [default run all queries from the root node]";
+ "--compose", Set compose, " ";
+ "-p", Set parallel,
+ " run all queries in parallel [default run all queries \
+sequentially]";
+ "--parallel", Set parallel, " ";
+ "-m", Symbol (List.map fst supported_models, set_model),
+ " specify tree model (naive or compact, default to naive)";
+ "--model", Symbol (List.map fst supported_models, set_model), " ";