XPath function

[Roberto Marra]

Hi guys, I don't know why with Cocoon some xpath function in an XSLT file works some other not. Let say for instance that " string-length(string)" works but if I try to use " string-join((string,string,...),sep)" Cocoon return me:   !-------------------------------------------------------------------------------- An Error Occurred Impossibile trovare la funzione: string-join org.apache.cocoon.ProcessingException: Unable to get transformer handler for file:/D:/Programmi/Apache Group/cocoon-2.1.5.1/build/webapp/mf/xsl/menu/menu.xsl: org.apache.excalibur.xml.xslt.XSLTProcessorException: Exception in creating Transform Handler column: 51 line: 62 cause: javax.xml.transform.TransformerException: Impossibile trovare la funzione: string-join location: null !--------------------------------------------------------------------------------- Any idea? Thanx in advance Roberto