Returns true if and only if for all nonterminals N on the right hand side exists at least one alternative where the nonterminal N is on the left hand side.
@return true if the grammar is well defined; false otherwise
See Implementation
Returns true if and only if for all nonterminals N on the right hand side exists at least one alternative where the nonterminal N is on the left hand side.
@return true if the grammar is well defined; false otherwise