16. The method of claim 15 in which said step for applying a recursive reduction procedure includes the step of applying a single and empty reduction effecting the removal of element rules combined as subrules with said acquired grammar element rule, R.
15. The method for reducing the number of rules of a sample grammar present as an electronic compilation of grammar elements associated as AND and element rules within a hierarchical document describing tree smacture, comprising the steps of: (a) acquiring a said grammar element with a rule, R, of a given type of said tree structure from said sample grammar, (b) applying a reduction guide selected recursive reduction procedure to .. said rule R and subrules thereof of said acquired grammar element; (c) removing any of said subrules when said applied reduction procedure has eliminated them from said rule R of said acquired grammar element; (d) acquiring a next said grammar element and reiterating the aforesaid steps a-c.