SGML does provide an official way of doing this folks
and even if Dan C ain't here to round us up we maybe
ought to stick to the track. It might have some useful
spinnoffs like people assuming that any SYSTEM attribute,
instead of being a "system defined" path for an
entity, would be a URI.
How about
<!ENTITY ICON6 SYSTEM "http://blah..">&ICON6;
Tim BL