n="top"><td valign="baseline" align="left"><nobr>allowed-unit-classes-of</nobr></td><td valign="baseline">&nbsp; </td><td valign="baseline" align="left" width="99%">
<code>(</code><var>space-instance</var> <code>standard-space-instance)</code>
<span 
    style="font-family: serif; font-style: normal">=&gt;</span> <var>extended-unit-class-specification-list</var>
</td></tr></table>
</p>
<p><span class="fndoclabel">Package</span>&nbsp;&nbsp;&nbsp;<code>:gbbopen</code>
</p>
<p><span class="fndoclabel">Module</