I have a growing collection of EPUB files from Storiesonline (
http://storiesonline.net). Due to the nature of the stories hosted on the website (primarily erotic, and covering an extremely diverse range of genres, 'situations', and activities), correct tagging is essential. Those responsible for the site do a good job. The metadata they provide is good. I inititally thought though, that I had spotted an error on their part; later I discovered it was a fault with Calibre's tagging system (or its way of displaying tags, at least). I'll give an example below.
Let's say one was to download a story that involves a male who has a sexual encounter with a teen-aged female. The story would be tagged somewhere with the letters 'Mf'. The upper case 'M' denotes an adult male, and the lower case 'f' denotes a female, below the age of 18 but above the age of 12. In Calibre this is rendered as MF, giving the impression that there is a sexual encounter between an adult male and female in the story. I don't understand why Calibre forces the lower case second letter into a capital.
'Ff' is rendered as 'FF', 'mm' as 'MM'. Why? I know it's a fault of Calibre as I've checked with the webmaster of Storiesonline, and tried some EPUBs from the site in EPUBReader (the Firefox extension). The latter displays the tags when viewing the metadata as they should be.
If a tag begins with a lower case letter is it automatically capitalised?
Please do not comment on the literary, artistic or moralistic merit of the stories published on the website, and instead steer discussion toward the rationale behind case-insensitivity of tags in Calibre.
Many thanks!