 and may in
turn be overridden by instances.
<P><DT><A NAME="M10"><B>filter</B> ?<I>-slotOperation</I>? ?<I>methodName ...</I>?</A><DD>
This slot (see <B><A HREF="define.html#M31">SLOTTED DEFINITIONS</A></B> below)
sets or updates the list of method names that are used to guard whether
method call to instances of the class may be called and what the method's
results are. Each <I>methodName</I> names a single filtering method (which may
be exposed or not exposed); it is not an error for a non-existent method