I don't think rng-schema-locating-files-default is intended to be
user-customizable. It's defvar'ed, not defcustom'ed, and it's not
mentioned in the texinfo documentation. By contrary,
rng-schema-locating-files is defcustom'ed and mentioned in the
documentation.
rng-schema-locating-files-default is effectively an internal variable.
This works for me:
(eval-after-load 'rng-loc
'(let ((my-nxml "~/path/to/local/schema/dir/"))
(when (file-directory-p my-nxml)
(add-to-list 'rng-schema-locating-files (expand-file-name
"schemas.xml" my-nxml)))))
I suggest closing this bug.
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