Notgram_opsval declare_notation_grammar : 
  Constrexpr.notation ->
  Notation_gram.notation_grammar ->
  unitval grammar_of_notation : Constrexpr.notation -> Notation_gram.notation_grammarraise Not_found if not declared
val declare_notation_non_terminals : 
  Constrexpr.notation ->
  Extend.constr_entry_key list ->
  unitval non_terminals_of_notation : 
  Constrexpr.notation ->
  Extend.constr_entry_key listval get_defined_notations : unit -> Constrexpr.notation listReturns notations with defined parsing/printing rules