Comment 2 for bug 1211433

Sorry for not being clear. English isn't my native language. I use comictagger myself, so I will try to explain it better. Comictagger uses Comicvine for its metadata, so I will use that as an example.

The problem is the following: There are sometimes two numbers to identify a comic: Volume and Issue.
Volume is used as a broad category. It is like a folder. Issue is used to identify the single comics inside a volume, like files inside a folder.

Volume is often needed to differ between series with the same name or a new very big story arch. For example Wolverine: http://www.comicvine.com/wolverine/4050-3157/ http://www.comicvine.com/wolverine/4050-43496/
But volume is used in different ways and the above problem is often solved not by volume but by publishing date. Unfortunately volume is also used sometimes if something is a collection of several issues in one book.

Issue is always used to identify the single comics and is always used. So it is much more fitted to be used for series_index. And even the collections are also tagged with issue. Each comic has an issue, but volume is often not really used or just 1 for each issue inside a series.

So volume is a better candidate to be included in the series_name and issue is used to index a series.

Your link to comictagger is more about finding the issue than the volume. Comictagger needs in its current state always an issue number. And if you have a bad filename, it does not find the issue number.

I hope it is now a little bit more clear. Volume is like a folder, issue is like files.
Another possibility would be to let the user decide, which to use and implement it as a tweek.

Thanks for looking into this so quickly :)