Hi Peter,

> The condition of hex color specs having to start with a hash mark
> is not enforceable in XML with a DTD.

That's the perfect answer to my question.  Now that you say it,  I realize 
that's true,  but I didn't think of it until you pointed it out.

< ... The # mark is merely a convention to herald a hex value and
> can only be enforced after validation by an application
> (or possibly a Schema).


I'm more interested in a tool that checks that for me rather than thinking 
about how to write an editor to do it.  As I mentioned in another post,  I 
found a command-line Windows version that flagged the error: 
http://prdownloads.sourceforge.net/int64/tidy-050522-exe.zip?download .

It's got an extra feature, automatic correction, that I really like as I 
hunt around for examples and rework them up to XHTML standards.

> Quite pretty, in fact (http://xml.silmaril.ie/colours.html :-)
It is.  I'm sending it to my grandsons!

> XML FAQ: http://xml.silmaril.ie/
Thanks for the link.  I'll study it as I continue my quest for XHTML 
excellence ... er, competence :-)

Regards,
Richard