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    Thank you belatedly for the effort that went into this answer. This is neater than the hack that I've been deploying, namely, of using hyphen to separate chapter and example numbers [e.g., (2-1)], letting makeidx compile that (it doesn't object), then opening up the .idn file and doing a search and replace of hyphen for dot. Commented Sep 23, 2014 at 15:32