I have an XML / XSD pair, which I usually edit with Altova XMLSpy. I am looking for a way to edit the XML through the web in a similar way to how XMLSpy works on Windows. The server-side would have to run on apache / linux. I am hopefully looking for something open source / free and that doesn't require a lot of effort to set up (that's why I don't want XSL) Does anyone know what's the easiest way to do this? Thanks in advance!