Παρακαλώ! Το σημαντικό με την xhtml είναι ότι έτσι έχουν πρόσβαση στην τοποθεσία άτομα με προβλήματα όρασης, καθώς και το ότι είναι πολύ εύκολο να δει κανείς το περιεχόμενο με άλλους τρόπους (π.χ. WAP, RSS).
The single, huge advantage it has over HTML is that XHTML can be parsed by anything (or any language) with an XML parser.
http://simon.incutio.com/archive/2002/08/11/benefitsOfXhtmlBenefits of XHTMLA painless transition to more advanced technology
The web is moving to XML, a powerfully enabling technology. Writing wellformed, valid XHTML pages is the easiest way to begin this transition. All it takes is learning a few simple rules of XHTML markup.
Cleaner, more logical markup
XHTML brings uniformity to document structure. The rules of XHTML help restore the structural integrity of documents that was lost during the web’s rapid commercial expansion between 1994 and 2001. This is critical for large organizations such as ours, whose web pages must interface with logicallymarkedup documents in legacy systems and databases.
Increased interoperability
Unlike oldstyle HTML pages, valid, wellformed XHTML documents can easily be “transported” to wireless devices, Braille readers and other specialized web environments. Moreover, XHTML’s insistence on clean, rulebased markup helps us avoid the kind of errors that can make web pages fail even in traditional browsers like Microsoft Internet Explorer, Netscape Navigator, and Opera Software’s Opera browser.
Greater accessibility
Because they follow strict rules and avoid nonstandard markup, wellauthored XHTML
LinksXHTML in Wikipedia