* lisp/nxml/nxml-mode.el (nxml-parent-document): Add a variable.
(nxml-parent-document-set): A function to set `nxml-parent-document'. (nxml-mode): Define using `define-derived-mode' instead of `defun'. (nxml-mode-hook): Remove `defcustom' (auto-defined by define-derived-mode'). * lisp/nxml/rng-valid.el (rng-dtd-trivial-p): Add a helper function for users who want to call `nxml-parent-document-set'.
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