It looks like XSLT also got cut in functionality in C3. I tried to rerun old XSL stylesheets with new C3 and gave up.
The error says nothing meaningful: <exception-report class="org.apache.cocoon.pipeline.SetupException" timestamp="Thu, 20 Jun 2013 19:58:23 +0200"><message>Impossible to read XSLT from 'javax.xml.transform.stream.StreamSource@cba24d', see nested exception</message><cause>Could not compile stylesheet</cause><stacktraceCause>javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(Unknown Source) at org.apache.cocoon.sax.component.XSLTTransformer.load(XSLTTransformer.java:216) at org.apache.cocoon.sax.component.XSLTTransformer.load(XSLTTransformer.java:165) at org.apache.cocoon.sax.component.XSLTTransformer.setConfiguration(XSLTTransformer.java:264) at org.apache.cocoon.sitemap.InvocationImpl.installComponent(InvocationImpl.java:257) at It looks like there is a problem with xsl:import/xsl:include from the main xsl stylesheet. Moreover I found that when <xsl:template match="RootElement" is not in the main XSL stylesheet the same error appears. Can we switch on more debugging info what is wrong ? Greetings, Greg