My understanding is I have an option (as far as the W3C is concerned) between using a DTD Doctype and an XHTML Schema to declare the language I am using (in my case XHTML 1.1). Regardless of browser issues what lines of code would I use to declare my document conforms to XHTML 1.1 using the XML schema method?
Read through the first section of [w3.org...] . Since the DTD DOCTYPE is required to trigger standards mode in IE, the dual method (§1.5) may be preferred.
You would have to serve the document as application/xhtml+xml or application/xml anyway, which makes IE compatibility not really an issue - and as such you wouldn't need the doctype at all when serving as XML...