Or, to express it the
> other way round, it needs to include all langflow elements where
> xml:lang isn't specified at all, as well as all langflow elements
> where xml:lang="en" is specified.
> 
> How would I express this in XSLT?

The problem is of course that lang("en") returns true for elements where
xml:lang="en", false where xml:lang="de", and false where it is unspecified.

I can't think of any way of doing the test other than the unweildy:

<xsl:if test="lang('en') or not(from-ancestor-or-self(*)[@xml-lang])">

In SAXON 4.2 you could write
<xsl:if test="^xml:lang='en' or not(^xml:lang)">

Mike Kay


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