@KevinH...I think you covered everything that I asked. Thanks for explaining it so thoroughly. I think we can say that my question is just not possible.
Regarding marking lines of text that you mentioned, I have already written a private plugin that only adds spans(with no styling) around only centered text and images in an epub. I just wanted to surround centered items with no-style spans to accommodate ebooks that I upload to iBook -- which still needs no-style spans for anything that's centered. The only way I could do this was to use a marker(like you suggested). I used a tilde symbol('~' ) to manually mark all centered items in my epub and that worked just fine. I haven't release that plugin because I thought it was redundant -- usually, for iBooks uploads, people mostly surround everything in their epubs with no-style spans which seems to work just as well. Thanks again for the explanation.
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