No, NO-ONE sensibly uses XHTML or XML as a source format to write books. They are an intermediate format for formatting. You MIGHT create very short documents in them.
And no publishing house uses XML as source format for books. They might have XML in the workflow. Fiction is via wordprocessor -> PDF proof.
Non-fiction is potentially more complicated if formulas etc involved.
We obviously have a completely different view of content creation and editing work flows.
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