lace</i></td><td valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign="baseline"> A <a href="ref-glossary.html#gl:form">form</a> which is suitable for use as a
<a href="ref-glossary.html#id88">generalized&nbsp;reference</a> containing a fixnum value
</td></tr><tr valign="top"><td valign="baseline" nowrap><i>delta-form</i></td><td valign="baseline">&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign="baseline"> A <a href="ref-glossary.html#gl:form">form</a> that is evaluated to produce a fixnum delta
value (default