ign="left">
<nobr><var>unit-class-or-instance-specifier</var> ::=</nobr> 
</td><td valign="baseline" colspan="1" align="left"> <var>unit-instance</var> | 
<code>(</code><var>unit-instance</var>*<code>)</code> | </td></tr>
<tr>
<td valign="baseline" colspan="1" align="left"></td><td valign="baseline" colspan="1" align="left"> <var>atomic-unit-class</var> | </td></tr>
<tr>
<td valign="baseline" colspan="1" align="left"></td><td valign="baseline" colspan="1" align="left"> <code>(</code><var>atomic-unit-class s