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Originally Posted by Turtle91
Hello,
I had a couple questions about Calibre's metadata for custom columns.
1) Is there an option to disable saving of a custom column's metadata to the book? I use custom columns within the GUI to help manage my library, but there isn't a need desire to have all any of that data in the file itself.
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There isn't an option, but others have found ways to do this using other calibre tools/plugins. I expect that one or more of them will chime in with the technique(s).
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2) If I must save it to the opf, is it possible to have a consistent output order?
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If you mean the file metadata.opf instead of the opf in an epub, then no tool will remove this information. That file is used by calibre to recover book metadata in case of a catastrophic crash and loss of its book database.
In either case (in or out of the book), there is no existing way to control the order of the columns or the info in the columns. Calibre keeps them in an efficient data structure (called a 'dict') for performance reasons. One consequence is that when the structure is saved the items appear to be randomized. Of course, calibre could be changed to write this information to the file in some known order but that would be a fair amount of work, error prone, and possibly incompatible with the old order. For these reasons I am not interested in doing it. Others, of course including Kovid, might think differently.