for iterations<BR>
for options<BR>
for attributes<BR>
for semantic parts<BR>
as explained below
</td>
<td valign=top>
(a | b) c ... a c | b c<br>
{a} b ... b | a b | a a b | a a a b | ...<br>
[a] b ... b | a b
</td></tr>
</table>

<P>Comments are enclosed in &quot;/*&quot; and &quot;*/&quot; and may be
nested. </P>

<P>Within strings the digraphs <TT>\"  \'</TT> and <TT>\\</TT> are used in
this version of Coco/R as in C++ to denote the quote, apostrophe and backslash
character respectively.  This represents