Converting Strict XHTML + CSS with XSLT

Most introductory texts to XSLT show how nice and easy it is to convert from
shapeless XML to HTML + CSS. I would like to do the opposite and convert
from strict XHTML + CSS to some other format using XSLT.In order to do so,
interpreting the stylesheet information during this transformation is
essential. Has anyone experience with this ?

Two additional questions (not directly linked to XSLT) :
    1) I have never heard of an XML representation of the CSS stylesheet
information. Is there such an initiative ? Corolary : Why are CSS not
represented using XML  ? Wouldn't this make their processing easier and
allow, for instance, selectors to be XPaths ?
    2) What is the advantage of using strict XHTML as compared to
transitional XHTML, apart from imposing stylesheets ?


P. A.




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