@namespace a url(http://www.example.org/a);
@namespace b url(http://www.example.org/b);
@namespace html url(http://www.w3.org/1999/xhtml);
*|p, *|address, *|q, *|r { display : block ; margin-bottom : 1em }
*|p, *|q { background-color : lime ! important }
*|*[|class~="foo"] { background-color : red }