The solution points to how, it appears, the book panel export is functioning: each file exports a set of tags referenced to itself; file01 adds a "1" to its tags, and so forth. What I was able to do was use a file referencing all of the tags in the style suite in two ways:
- first, I exported to an epub the single file, creating a fairly clean CSS, which I then extracted and renamed;
- then, making certain that file was the "source" file in the book panel, I mapped for export all of the tags, being careful to be certain each tag/class combo was same as in renamed clean CSS;
- I synchronized the whole shebang;
- I exported to epub, adding my clean CSS as an external style sheet, selecting only "include embeddable fonts".
Beautiful! Thanks for sharing that!
Also, applauds to "celkins" at InDesignSecrets.com for both the description of her problem and her solution, which confirmed, for me, that my "experimental" process was the right path, and perhaps, the best path to a solution.