'The Jacobite Trilogy' could be a metatag, with 'Flight of the Heron', 'Gleam in the North' and 'The Dark Mile' as subtags. Then everybody could tag with and filter on any of those four tags, as they prefer.
I think that would be a great solution! And what's even more baffling is that there are examples of structurally similar related fandoms that do exactly that—e.g. Tolkien's legendarium and Shakespeare's Henry IV parts I and II both have sub-tags and meta-tags.
The worst practical consequence IMO is just that it isn't in the main list of fandoms—people who've read FotH and go looking for fic won't find it under the title of the book they've read and won't know the canonical title which Broster didn't use! However, I don't think that's true about exchange tagsets—I nominated it under the correct title for both Yuletide 2020 and the most recent round of Hurt/Comfort Exchange, and in both cases it appears in the 'books' section of the tagset as you'd expect.
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I think that would be a great solution! And what's even more baffling is that there are examples of structurally similar related fandoms that do exactly that—e.g. Tolkien's legendarium and Shakespeare's Henry IV parts I and II both have sub-tags and meta-tags.
The worst practical consequence IMO is just that it isn't in the main list of fandoms—people who've read FotH and go looking for fic won't find it under the title of the book they've read and won't know the canonical title which Broster didn't use! However, I don't think that's true about exchange tagsets—I nominated it under the correct title for both Yuletide 2020 and the most recent round of Hurt/Comfort Exchange, and in both cases it appears in the 'books' section of the tagset as you'd expect.