code> is used if
<code>i="spice"</code>. Of course, these actions only make sense for objects that
contain the relevant items within their <code>data</code> slot.</p></li>
<li><p>After these possibilities are eliminated, the action depends on whether
<code>j</code> has been provided.  If <code>j</code> is not provided, or is the string <code>""</code>, then
<code>i</code> is sought in the <code>metadata</code> slot, and then in the <code>data</code> slot, returning
whichever is found first.  In other words,