sig
val build_parse_code :
Code_selection_context.code_selection_context ->
Algebra_type.algop_expr ->
string ->
Algebra_type.alg_eval_code_dep *
Code_selection_context.code_selection_context
val select_physical_op :
Code_selection_context.code_selection_context ->
Algebra_type.algop_expr ->
string -> Xquery_physical_algebra_ast.physop_expr_name
end