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ComicRack is a Windows application which permits to have a comic book library. To organize the library, ComicRack permits to specify values for predefined metadata (author, title, series, and so on).

Idea
Okular gives the possibility to read comic books. The idea is to add the functionnality to Okular to understand those metadata, display them and edit them, like Amarok can do for music files, for example.

How
Those metadata are stored inside the comic book archive, as an XML file.

As far as I understand tags are single keywords to be associated with a file, and not attributes that may be assigned. So what you are suggesting is that somehow Nepomuk will be able to differentiate between which files are comics (comic archives?) and allow the user to create attributes for it as such? After this is done from what I understand you want Okular to be able to recognise these attributes as being special to the file and display them?

It sounds as though you are proposing some extension on what Nepomuk was designed for - could you perhaps apply this to a more generic scenario?

(Keep in mind we also have the "comments" attribute you can add to files, or "review" and "bookmark" things viewed in Okular - does that in any way accomplish what you are trying to do?)

You are right. I should not have used the term "tag". I should have said metadata. From what I have understood, Nepomok can query its database searching for values for specific music metadata (artist, and so on). My idea was to have the possibility to search for ebook specific's metadata (author, series...). I will edit my idea, remplacing the term "tag" by "metadata" and adding a scenario.

I would perhaps suggest then if we changed it into a request to create "metadata templates", eg: a set of metadata that would apply to ebooks (author, title, series) or another that might apply to essays perhaps (professor, title, mark/grade, etc) - the reason I say this is because filetypes are varied - Okular for example will not be what I open up my plaintext ebook in, whereas it might do fine for a technical manual, and for all I know a comic might open up in Gwenview. Applications should therefore autodetect any added data and display it prominently.

How about that?

Yes, that would be a good idea, but wouldn't this be another idea, not necessary related to this one ?
By the way, it seems like I cannot edit the title to remove the "tag" term and replace it with "metadata".

Edited and approved.