The non-terminal <keyword> is used but not defined.

--
John Cowan          http://www.ccil.org/~cowan        xxxxxx@ccil.org
We want more school houses and less jails; more books and less arsenals;
more learning and less vice; more constant work and less crime; more
leisure and less greed; more justice and less revenge; in fact, more of
the opportunities to cultivate our better natures.  --Samuel Gompers