If you want a <p> around the whole content of the body, do as Sam suggests. If you want something else, we'll need a more detailed spec of your requirements.
And get rid of that disable-output-escaping="yes". You don't need it, and it will cause the stylesheet to produce incorrect output if your data contains special characters that need to be escaped. This facility is for experts only - it's very dangerous in the hands of a beginner (and experts very rarely use it).
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference