Is this a fairly common practice
yes, it's pretty much the scenario for which XSLT was designed.
and what effect is on performance,
minimal if it's working on the local file system, if you are fetching
files from a remote server, there may or may not be a noticable effect
of having to make another (http, usually) connection, depending on how
slow your connection is. As always with performance questions it's
highly dependent on your local setup, only sure way to answer this is to
time it.
Also, in my case is "include" or "import" recommended.
depends what you want to do. If you want to sometimes over-ride the
"common" templates with a specific template then usually xsl:import is
better as the import precedence feature is designed for just this use.
Sometimes though import precedence gets in the way and you want the
"common" templates to act just as if they were in the top level
stylesheet, in which case xsl:include is your friend.
David
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