The code lines are copied 1:1 (even typos were copied) from the book Wirth, Niklaus: Compilerbau: Eine Einführung. 4. durchges. Aufl. - Stuttgard: Teubner, 1986. (LAMM Bd. 36) (Teubner-Studienbücher: Informatik) ISBN 3-519-32338-9 (The code from the pdf version of the dutch book differs from mine, see http://members.home.nl/jmr272/Oberon/CompBouw.pdf) 2009-10-15 solyga@beast