+ <para>
+ The actual lisp type for a slot may be different than the
+ value specified by the <parameter>:type</parameter> attribute.
+ For example, a slot declared with "<parameter>:type (string
+ 30)</parameter>" actually sets the slots Lisp type as
+ <parameter>(or null string)</parameter>. This is to allow a
+ &nil; value or a string shorter than 30 characters to be
+ stored in the slot.
+ </para>