Kevin Rodgers <kevin.rodgers@ihs.com> wrote:

> Do these mean that only a lower case "x" is allowed after "&#" in a
> hexadecimal character reference open delimiter?

In SGML, case sensitivity of delimiters is defined through the
NAMECASE section of SGML declaration.

In SGML Annex L.2, NAMECASE is defined as "GENERAL NO".
And in HTML 4.01, NAMECASE is defined as "GENERAL YES".

So hcro (&#x) is case sensitive in XML, but not in HTML.
Both of &#x123; and &#X123; are valid in HTML,
but &#X123; is not well-formed in XML.


Regards,
-- 
Satoshi ISHIKAWA / webmaster@satoshii.org
http://www.satoshii.org/markup/