ok Kovid. I downloaded Calibre and tested a few ePub files I had, here's my notes:
1) It's a great application if you want to generate Mobi, Sony, and ePub files.
2) I wanted to fix errors the checkers (1.0.3) threw "attribute not allowed". I was hoping Calibre can fix this really quick. So here's what i did, I uploaded the ePub file in Calibre, and once again, converted the same ePub file to ePub! I was hoping this will do the rick, but appearantly, it didn't. Any suggestions?
3) So what is that Calibre is doing that the checkers are not doing to the ePub file? Can you package an ePub file if I "unzipped it", then fixed XHTML or whatever needed fixing?
4) I think options like "Validate ePub" or "check ePub" with an editor to clean up the files you need to clean then re package might be a great new feature to the tool.
5) You mentioned there is no one tool, can you please point me to "the collection of reliabe tools", beside your fine Calibre tool
that I would need to generate and check my ePub files.
Jellyby, thanks for your link. This clarified a lot of the errors I seen in all versions of checkers. but I am confused and worried now, if I am hearing 2 different answers on the checkers.