Tools to "compile" RNG + included schema into single schema?

Is there a tool that takes a Relax NG schema that includes one or more
other schema files, and produces a single Relax NG file that is
reasonably human-readable?

I know about and have used rng2srng, but the simple-syntax form it
produces is optimized for machine processing and is not what you'd call
readable code. Is there an alternative?

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