
<pre>
(class +EuOrd +Ord)                    # EU-specific order subclass
(rel nr (+Alt +Key +Number) +XyOrd)    # Maintain the key in the +XyOrd index
</pre></dd>

<dt><a id="+Any"><code>+Any</code></a></dt>
<dd>Class for unspecified relations, a subclass of <code><a
href="refR.html#+relation">+relation</a></code>. Objects of that class accept
and maintain any type of Lisp data. Used often when there is no other suitable
relation class available. See also <a href="ref.html#dbase">Database</a>.

<p>In the 