I'm not an expert at this sort of thing, but I gave it a go. At least, I got a foot hold.
I started with the PF1 structure, and modified some things.
https://www.dropbox.com/s/0xnptqzv00...structure?dl=0
Tag Domains
-Background
-Character Condition (Copied, then renamed and hid original)
-Class (Copied, then renamed and hid original)
-Spell Level (Copied, then renamed and hid original)
-Ethnicity
-Language
-Magical Tradition
-Magical Trait
-Feat Trait
-Ancestry (Copied, then renamed and hid original [Race])
-Ancestry Heritage
-Weapon Trait
-Armor Trait
-Renamed and hid Spell Subschool
-Renamed and hid Weapon Type
-Renamed and hid Armor Type
-Renamed and hid Archetype
-Renamed and hid Archtype/Domain/Etc.
-Tag domain for each archetype.
-Renamed and hid Feat Type
-Rarity Trait
-Renamed and hid Challenge Rating
-Level
Categories
-Individual (Copied, then renamed and hid original)
-Spell (Copied, then renamed and hid original)
-Creature (Copied, then renamed and hid original)