xml reader

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!

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