ect, and combines all keys in that order into a single
index key. See also <code><a href="refU.html#+UB">+UB</a></code>, <code><a
href="refA.html#aux">aux</a></code> and <a href="ref.html#dbase">Database</a>.

<pre>
(rel nr (+Ref +Number))                # Normal, non-unique index
(rel nm (+Aux +Ref +String) (nr txt))  # Combined name/number/text index
(rel txt (+Aux +Sn +Idx +String) (nr)) # Text/number plus tolerant text index
</pre></dd>

<dt><a id="abort"><code>(abort 'cnt . prg) -> any</code></a></dt>
