Dear Sirs I'm trying to produce a PDF from a docbook xml file. I need to use a customization layer but I keep receiving an error message like this: [Saxon6.5.5] ERROR: Document root element for FO output must be one of the following elements: appendix article bibliography book chapter colophon dedication glossary index part preface qandaset refentry reference sect1 section set setindex and SystemID: /Users/Sandro/Documents/quaderni_storicamente/index.xml Engine name: Saxon6.5.5 Severity: error Description: Cannot apply cascading transformation. Reason: Processing terminated by xsl:message at line 207 Here is the xsl <?xml version='1.0'?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0"> <xsl:import href="fo/docbook.xsl"/> <xsl:template match="/book/chapter/para[@role = 'intro']"> <fo:block border="0.5pt solid blue" padding="3pt" xsl:use-attribute-sets="normal.para.spacing"> <xsl:apply-templates/> </fo:block> </xsl:template> </xsl:stylesheet> Thank you in advance Claudio