I’m running oXygen 14.2 on Windows 7 64bit. I tried to configure a customized calabash. There’s a calabash.bat file, https://subversion.le-tex.de/common/calabash/calabash.bat, that I checked out locally and specified as a custom processor, but I also tried to give the Java invocation explicitly, as seen in my project configuration: <field name="cmd"> <String>java -cp ${pd}/calabash/resolver/resolver.jar;${pd}/calabash/resolver;${pd}/calabash/calabash.jar;${pd}/calabash/lib;${pd}/calabash/lib/ltx-unzip -Dfile.encoding=UTF8 -Dxml.catalog.files=${pdu}/calabash/resolver/catalog.xml -Dxml.catalog.catalog-class-name=org.apache.xml.resolver.Resolver com.xmlcalabash.drivers.Main -E org.apache.xml.resolver.tools.CatalogResolver -U org.apache.xml.resolver.tools.CatalogResolver -c ${pdu}/calabash/lib/ltx-unzip/ltx-config.xml </String> </field> The first problem that I ran into was that Windows gave an access denied error. I knew that it was Windows because it was in German while my oXygen installation is in English. This will become important to overcome later because the custom Calabash needs to run on users’ computers. They don’t have admin privileges. So I ran oXygen as admin. Then it ran in principle, but the (command line?) options – input and output ports, the pipeline, and options – that I configured in the transformation scenario apparently weren’t passed to the script. The output was only the usage information of my custom calabash. In the help I read an entry called “Integration of an External XProc Engine”. I don’t know whether that is relevant to my problem. Do I really have to implement ro.sync.xml.transformer.xproc.api.XProcTransformerInterface myself? What’s the purpose of being able to configure an external script / Java invocation as XProc engine? When I think about configuring an engine.xml file for my purposes, I’m unsure how to map Calabash’s -c option, where I specify an option to use our configuration file that maps a step name to a class that implements an extension. The config file is here: https://subversion.le-tex.de/common/calabash/lib/ltx-unzip/ltx-config.xml If someone at syncro soft wants to play around with the custom Calabash, just check it out with svn. Thanks for your help. Gerrit