Reaping and Eureka enchantments for more XP

So, my idea is for two new enchantments to be added that would be useful but not overpowered. The first is Reaping for swords and axes. Each level increases the amount of experience monsters and animals drop. The second is Eureka for tools. Each level increases the amount of experience gained from mining ores. Of course, these names can be changed, and maybe they could be treasure enchants, but I think that we really need them.