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Old 10-30-2020, 05:22 PM   #16
BetterRed
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I don't know the cause of the problem you described, but If you are going to keep two versions of calibre using the same libraries, you are advised to use 4.23. Supposedly there were some changes to the database structure that cannot be handled by versions earlier than 4.23.
FWIW: I occasionally access some of the libraries I use with installed version 5.x. with version 2.85.1 (server) and 3.48 (EPUB viewer) for the purposes indicated.

I don't use the ePub Annotation feature in 5, but the fact that new tables are there doesn't seem to stop versions 2 and 3 doing what I want. Some plugins add tables to the database schema but they don't get in the way of 'business as usual' functionality.

My memory of the database wars is that one advantage of a Codd relational database like DB2 over a Bachmann network database like IDS was the relative ease of adding new entities to the schema. But I still think in terms of network structures

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Old 10-30-2020, 05:26 PM   #17
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I figure the worst that could happen is that any annotations stored in the database may be lost.

There seems to be a few layers of redundancy to this though - the annotations are also stored as jsons in the appdata folder, and embedded in the ePub if that's enabled, so if they did disappear they would hopefully restore themselves to the annotation browser after opening the book again.
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Old 10-30-2020, 06:13 PM   #18
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Some plugins add tables to the database schema but they don't get in the way of 'business as usual' functionality.
I thought this would definitely be no-go. Out of curiosity, which plugins do that?
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Old 10-30-2020, 07:41 PM   #19
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I thought this would definitely be no-go. Out of curiosity, which plugins do that?
Calibre-spy for sure, and maybe some Job-spy features and some of the more esoteric plugins from DaltonST

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Old 11-01-2020, 09:06 AM   #20
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5.x adds annotations to ebook-viewer. Even though I use DeDRM, I decided that the new annotations feature was worth the hassle.
I'm not sure what you mean by "annotations" but the ebook reader in v4 displays annotations nicely as exist in "The Annotated Pride and Predujice".
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Old 11-01-2020, 09:54 AM   #21
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I'm not sure what you mean by "annotations" but the ebook reader in v4 displays annotations nicely as exist in "The Annotated Pride and Predujice".
He means the new calibre feature that allows you to highlight text and make notes.
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Old 11-01-2020, 10:17 AM   #22
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I'm not sure what you mean by "annotations" but the ebook reader in v4 displays annotations nicely as exist in "The Annotated Pride and Predujice".
That is a PRE-annotated book.
We are on about User (done) Annotations. There is no standard and not all devices have a easy to use 'Notes' feature. Then, they are only usable on that brand.
Calibre just made their version available to users (the Interop is still a no-go)
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Old 11-01-2020, 04:08 PM   #23
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It seems to me that there should be an epub annotations standard.
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Old 11-01-2020, 04:10 PM   #24
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It seems to me that there should be an epub annotations standard.


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Old 11-02-2020, 08:36 AM   #25
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Well said --
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Old 11-02-2020, 09:22 AM   #26
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The advantage of "standards" is that there are so many to choose from: There is always one that suits your liking.
The disadvantage of "standards" is that there are so many to choose from ...
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Old 11-02-2020, 06:38 PM   #27
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As much as I like that cartoon, isn't the problem that there is no current standard for ebook annotations? Adding one would actually be good so that the apps and devices could implement it.

Of course, I don't actually expect that it would be implemented anywhere useful. I doubt that Amazon would. I think Kobo might have if it was there when they started, but I don't know about now. So, it would be up to app developers to implement and see what happens. Of course, I can't help wondering how long after a standard came out before a "better" one came out.
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Old 11-02-2020, 07:27 PM   #28
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There is a draft for an Open Annotations in EPUB standard, made by the IDPF.
But it is stuck as a draft since 2015... so, I wouldn't hold my breath.
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