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Install x11docker
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Run PDFEdit, e.g
Debugging XProc is mostly a process of elimination, sometimes with hints from the error messages. Here follows an example of debugging XProc with oXygen. The process is similar for other editors. The following is more of a story to show how debugging XProc can be done, and not so much a document to look up solutions to your particular problem.
This is the XProc script we are working on: