If no output is specified for the result of a transformation oXygen sets the system ID as the stylesheet for the virtual result that is presented in the oXygen results area. That is why you get that error message. Without setting a system identifier for the output it would have not been possible to use relative locations for result document without setting an output destination in the transformation scenario.
Hi George, I think the point is that: <xsl:template match="/"> <foo/> </xsl:template> and <xsl:template match="/"> <xsl:result-document> <foo/> </xsl:result-document> </xsl:template> ...are equivalent - the output URI is the same in both cases - so the exception shouldn't occur. Fwiw, I do the same in Kernow (although it's been a while since I wrote it and its all a bit hazy now) - when no output file is specified (so all output goes to standard out) the base output uri is the systemId of the stylesheet.... and in Kernow it seems fine. I basically do: controller.setBaseOutputURI(stylesheet.getSystemId()); ....with the Result being a StreamResult(System.out). -- Andrew Welch http://andrewjwelch.com Kernow: http://kernowforsaxon.sf.net/