Correct Doctype for XHTML is (choose as needed):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
In addition, an example of code might be: instead of writing <BODY> or
Nokia Connecting People:
http://www.forum.nokia.com/main/1,6566,1_1_25_30,00.html#06
What is XHTML Mobile Profile?
XHTML Mobile Profile is defined by WAP Forum, starting with XHTML Basic and
adding few elements and attributes from full XHTML 1.0 that are useful in
mobile browsers including additional presentation elements and support for
internal style sheets. XHTML Mobile Profile is a strict subset of XHTML.
This may or may not be what you were looking for but this page has more
information on it which may be helpful.
Happy coding.
Kathy