mulitple xsl:import from different directories

Hello,

I have a master XSL file that need to include/import several xsl files located
in a directory 'xsl_dir'.
However, I don't know in advance the number and names of xsl files.
So, I basically need to do something like :
  <xsl:include href="xsl_dir/*.xsl"/>

I'm using XSLT2.0 with Saxon 9.3 HE.

Any idea on how I could achieve this ?

Thanks

Olivier