rings must
not cross line borders. Keywords are </P>

<PRE>
   ANY         CASE        CHARACTERS  CHR         COMMENTS
   COMPILER    CONTEXT     END         EOF         FROM
   IGNORE      NAMES       NESTED      PRAGMAS     PRODUCTIONS
   SYNC        TO          TOKENS      WEAK
</PRE>

<P>The following metacharacters are used to form EBNF expressions: </P>

<table cellpadding="4">
<tr>
<td valign=top>
(   )<BR>
{   }<BR>
[   ]<BR>
&lt; &gt;<BR>
(. .)<BR>
= . | + -
</td>
<td valign=top>
for grouping<BR>
