I'll try and line out what I was thinking about to be used under the 'extract' title.
Some spells, like Blades of Fire or Greater Magic Weapon, are about increasing the stats of weapons (there are other spells that do the same for armor or the individual themselves). Then, there are other spells, such as Blunt Weapon, that deal with removing bonuses from items or inhibiting their effectiveness. That second group is what I'm referring to as (for now) Extract.
Consider the following chart:
add bonus
to weaponStrip weapon of
magical propertiesInflict penalty
for wepaonWeapon with
magical bonus?? ?? ?? Regular weapon Enchant N/A Disenchant Weapon with
magical penalty?? ?? ??
Keep in mind that "weapon" could also be, or not be, armor piece as well as the creature itself etc. And that one definition could, possibly, probably, tick more then one cell in the Table.
Since no one ever tried to reorganize these spells to ordered boxes, definitions aren't as clear cut as they could be.