[xsl] Adding a class to HTML's class attribute

["Kai Weber" <weber@xxxxxxxxxxxxx>]

Hello,

I have a HTML which transformed with XSL. It contains tags like these

1. <li class="foo"></li>
2. <li></li>

I want to add a certain class to the attributes:

1. <li class="foo bar"></li>
2. <li class="bar"></li>

Anybody with a smart solution? The only (dump but simple) solution I
have in my mind is to use <xsl:choose> to handle the different cases.

Regards, Kai