I've used a parameter passed at run-time to do this.

Example:
saxon -o foo.fo foo.xml foo.xfo path=http://xxx.xxx.xxx.xxx/dir/

<xsl:stylesheet ....>
    <xsl:param name="path"/>

   <xsl:template match="foo">
     <xsl:variable name="getFileInfoPath"
select="concat($path,'common/getFileInfo.xsl')" />
   </xsl:template>
</xsl:stylesheet>

HTH,
John


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