@KevinH. Thanks for explaining it so thoroughly. And it's definitely worth remembering. I also remember that when I was writing the IDErrorCheck plugin I was determined to use the bk.get_opf() method because I'd never used it before and it looked so easy. But I had to play around with it for quite a while(and read DiapDealer's Sigil manual) before I clocked and understood what it did and eventually got the opf line numbering right.
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