Hi , First of all I wish Cocoon community an happy new year. I'm using Cocoon v1.8 and I would like to use the James Clark's XT transformer API. But the XTTransformer class which comes with v 1.7.4 don't take care of xsl:parameter like XalanTransformer does. Has anybody ever implemented this before ? Moreover when I use It I get an Exception : com.jclark.xsl.dom.TransformException: illegal character Does somebody know this problem. Thanks in advance for your response.