I suggest tagging the book with the tag jurassic-park-1990 to make concrete that it is separate and to ensure it is more clear what that tag is used for, without the year I see it as quite probable that people would mistag questions with the book tag.
I agree with the rest of the hierarchy proposed above, using jurassic-park-series as the overarching franchise tag and otherwise just having separate film/book tags. I don't think jurassic-world needs to be renamed, but I disagree with it's current use as a "trilogy tag" (as descried below), and should be used exclusively for the 2015 film.
Below I've outlined various policies and conventions and why I think the proposed suggestion makes sense.
From the current usage, using a single tag for two works and two "franchises" (I say "franchises" as one seems to be a sub-franchise of the other) is against our policies on franchise vs author vs works tags. From the answer linked, we see that for works and franchises questions should:
- If the question is about a work of fiction, it always gets a tag; if we have to create one, we do that (give it a tag wiki, etc.) If there's confusion over what to call it, bring it to meta.
- If the work in question is part of a larger franchise, also give it that tag always. This makes it easier for people to follow/ignore/etc. one tag and cover the entire franchise.
As such users who want to follow the entire franchise (jurassic-park-series in the above case) can choose not to follow any of the material from the books, similarly, those who only want to follow specific films (e.g. the first) can do so without having to follow the entire franchise.
The proposed tag names also seem to be in accordance with our tagging habits. With regards to the difference between the book and the adaptation, sometimes we decide two tags is unnecessary, however when there's significant difference we may decide on providing two tags (Exhibit B).
Not tagging trilogies.
The most glaring example of such, comes from Star Wars, where we have the universe tag (star-wars) and the individual film tags (a-new-hope). As most people know Star Wars is famously split into 3 trilogies, the Original Trilogy, the Prequel Trilogy and the Sequel Trilogy, however no tags exist for them, and there isn't really a need for such tagging, given it is all one canon.
That being said, we do have a few trilogy tags, when they exist in separate canons (nolan-batman-trilogy) or when it's a trilogy of books (mars-trilogy).
In this case, leaving it as proposed above (without trilogy tags) seems perfectly acceptable.
Appending "series" to [jurassic-park] for the franchise tag (jurassic-park-series)
While this may not be the most beautiful, we've become quite fond of them:
The series appendix tends to be favoured against the franchise appendix, although they really are interchangeable.