I want to find all stylesheet definitions in a XHTML file with lxml.etree.findall. This could be as simple as

elems = tree.findall('link[@rel="stylesheet"]') + tree.findall('style')

But the problem with CSS style definitions is that the order matters, e.g.

<link rel="stylesheet" type="text/css" href="/media/css/first.css" />
<style>body:{font-size: 10px;}</style>
<link rel="stylesheet" type="text/css" href="/media/css/second.css" />

if the contents of the style tag is applied after the rules in the two link tags, the result may be completely different from the one where the rules are applied in order of definition.

So, how would I do a lookup that inlcudes both link[@rel="stylesheet"] and style?