validation clauses raise a procedure argument violation
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
update validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
updated validation clauses
fixed validation clauses
updated validation clauses
fixes for texinfo formatting in documentation
documentation reorganisation