When styling XML with CSS, how to refer to tag names that contain points or colons?

[Soadbageagegepoc]

I'm styling an XML document that contains tags like \[code\]<a.b></a.b>\[/code\] or \[code\]<b:c></b:c>\[/code\]. Now of course if I write CSS rules like \[code\]a.b {} b:c {}\[/code\]These characters will get interpreted as classes and pseudo-classes, respectively. Is there a way to refer to these tag names with CSS? (I don't want to use XSL...)