xml - Notepad++ incorrect syntax highlighting?

So I want to build a XHTML 1.0 Strict based website. Using Notepad++ for syntax highlighting came as an idea to me. But when I tried to put the XML declaration (as stated in the spec, proper XHTML pages should use a XML declaration and be served as application/xhtml+xml) I can't get the entire document highlighted propperly. Here is the code I used for a basic page:

    
        
        
        
        
    
    
        
TEST
    

Paste this in Notepad++ and you'll see that it won't highlight the code between (it renders its background white) if language is set to XML. If I set the language to HTML, then the script gets correctly highlighted but the XML declaration is not. What to do? How to make a hybrid language - combination of XML and HTML?