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Proposal: only XML 1.x documents(proper Documents in the XML sense) pass between components; if you need to pass something else in your pipeline, the pipeline author has to wrap and unwrap as necessary. Accepted.
I imagine we have in the future to specify what kind of proper documents : - multiple roots allowed ? - strict well formed ?
Proper documents means "well-formed" XML 1.x documents. That excludes multiple-roots.