Smylers pointed out (and Danny Brian confirmed):
The default entities are C<<>, C<>>, C<&>, C<'>, and C<">.
I *knew* there was a good reason I shun XML! ;-) Clearly five entities is I<not> going to suffice. The synposis now reads: To include named Unicode or XHTML entities, use the C<E<>> code. If the contents are not a number, they are interpreted as an upper-case Unicode character name, or as a lower-case XHTML entity. For example: Thanks for that. Damian