Quote:
Originally Posted by Jack_Graham
My reader (UBReader) can sort the books by Title or by Author or by date added. As for the OPF file - Nope, not there. There is not one OPF file on my tablet, and yet the reader can pull Author and Title from the metadata for sorting - and I can pull up the "description" to read as well. That is pretty much all it can do. OH, I can view the cover as well, as long as it is part of the EPUB data. It does not use separate image file (I've tested it by using on image in the EPUB and another Image File as cover and it only looks at the one in the EPUB.) So my reader only uses the EPUB file itself, Not the JPG and not the OPF - so I do not even transfer them to the tablet. And it access the metadata somehow.  |
And where do you think your reader gets that information? From the OPF. The OPF is inside the ePUB, without it no reader can function. Calibre stores an OPF outside the ePUB, but that is not the same OPF.
The OPF you can edit in Sigil is of course the one in the ePUB.
It might be a good idea to get some basic knowledge about the structure of an ePUB from the wiki.