[xsl] xsl:import performance problems
Subject: [xsl] xsl:import performance problems|
From: Ronan Klyne <ronan.klyne@xxxxxxxxxxx>
Date: Tue, 29 Jan 2008 16:01:07 +0000
I have recently found that a particular pattern of imports causes my
stylesheet to take a very long time to compile. I really wasn't
expecting this to happen, and now I hope that someone can explain to me
what is happening...
I have a set of 20 xsl files, with an extra 'master' xsl file which
imports the other files. This works and performs well.
I ran into problems when I changed this arrangement. In an attempt to
break up the set of files so that I could re-use small parts of them
elsewhere, I added an import statement to each file so that each
imported the files it depended upon. This works out at an average of 3
imports per file, with one particular file being imported in almost
When I did this, it went from taking 2 seconds to compile to 20 seconds
(measured using Saxon's -t switch).
I can't for the life of me work out why this change would cause such a
drastic slowdown. Does anyone have any thoughts or advice on the matter?
I am using Saxon 6 on Java 1.6, btw.
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