> When transforming xhtml documents, I found out that sometimes an
> xml:space="preserve" attribute is added.
> If the xhtml document has doctype XHTML Basic 1.0, the attribute is
> added. If the doctype is XHTML 1.0 Strict, it isn't.
>
> Why this difference, and how do I prevent it?

The are probably defaulted by the DTD.  To prevent them just add a
no-op template:

<xsl:template match="@xml:space"/>

cheers
-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/