I wrote:
> Satoshi ISHIKAWA writes:
> > 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 ģ and ģ are valid in HTML,
> > but ģ is not well-formed in XML.
> 
> So how is that resolved in XHTML 1.0, which is a reformulation of HTML
> 4.01 (case-insensitive HCRO) in XML 1.0 (case-sensitive HCRO)?

I found the answer: it is resolved in favor of XML (case-sensitive
HCRO).  See http://www.w3.org/TR/xhtml1/#h-4.12 

Thanks,
-- 
Kevin