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diff --git a/src/grammar.mli b/src/grammar.mli
index 3e355d4..dcf0067 100644
--- a/src/grammar.mli
+++ b/src/grammar.mli
@@ -1,3 +1,46 @@
 type t
 
+type node = [ `Grammar ] Node.t
+
+type p_type  = [ `Parameter ]
+type n_type = [ `NonTerminal ]
+type t_type = [ `Terminal ]
+type any_type = [ p_type | n_type | t_type ]
+type symbol = [ any_type ] Node.t
+
+type p_symbol = p_type Node.t
+type n_symbol = n_type Node.t
+type t_symbol = t_type Node.t
+type tn_symbol = [ n_type | t_type ] Node.t
+
+type partial =
+ | Leaf of node
+ | Node of tn_symbol * partial array
+
+
+val is_terminal : [< any_type ] Node.t -> bool
+val is_non_terminal : [< any_type ] Node.t -> bool
+val is_parameter : [< any_type ] Node.t -> bool
+
+external get_symbol_at : t -> symbol -> node -> symbol = "caml_grammar_get_symbol_at"
+external first_child : t -> symbol -> node -> node = "caml_grammar_first_child"
+external next_sibling : t -> symbol -> node -> node = "caml_grammar_next_sibling"
+external start_first_child : t -> node -> node = "caml_grammar_start_first_child"
+external start_next_sibling : t -> node -> node = "caml_grammar_start_next_sibling"
+external parameter : [< any_type ] Node.t -> p_symbol = "%identity"
+external terminal : [< any_type ] Node.t -> t_symbol = "%identity"
+external non_terminal : [< any_type ] Node.t -> n_symbol = "%identity"
+external get_id1 : t -> n_symbol -> tn_symbol = "caml_grammar_get_id1"
+external get_id2 : t -> n_symbol -> tn_symbol = "caml_grammar_get_id2"
+val get_param_pos : n_symbol -> int
+external nil_symbol : t -> t_symbol = "caml_grammar_nil_id"
+val num_params : n_symbol -> int
+val num_children : [< t_type | n_type ] Node.t -> int
+external is_nil : t -> t_symbol -> bool = "caml_grammar_is_nil"
+
+val tag : t_symbol -> Tag.t
+val symbol : n_symbol -> int
+val tag_operations : t -> Tag.operations
+
+
 val load : string -> bool -> t