or in attribute values
need to be replaced by the corresponding escape sequence. For example, if you want to
use  &amp; in an <TT>href</TT> value, this should be represented as  &amp;amp;.
<P>
<B>NOTE:</B> The features and syntax supported by these labels are
modeled on HTML. However, there are many aspects that are relevant
to Graphviz labels that are not in HTML and, conversely, HTML allows
various constructs which are meaningless in Graphviz. We will generally
refer to these labels as "HTML labels" rathe