Thanks again! I have tried xml:lang="none" and EpubCheck has passed it. Moreover, searching the iso database for that found no match--I tried "gib" for "gibberish", but there is a real language with such code...
Aside from this particular non-fiction book, there are tons of my favourite SF & Fantasy works chock-full of words in the author's tooled lingo. Klingon is nothing to it--think of Edgar Rice Burroughs! I suspect the Tarzan, Barsoom, Venus, ... series haven't got their own iso entries.
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