 any other shape (except 
<TT>point</TT>), the HTML label will be embedded within the node the
same way an ordinary label would be.
<P>
The following is an abstract grammar for HTML labels.
Terminals, corresponding to elements, are shown in bold font,
and nonterminals in italics.
Square brackets [ and ] enclose optional items.
Vertical bars | separate alternatives.
Note that, as in HTML, element and attribute names are case-insensitive.
(cf. sections 3.2.1 and 3.2.2 of the 
<A HREF="http://www.w3.org/TR/htm