[Fiahil]

Like you would put `package-z >= v1.2.3` in your dependency manager, lawful requirements could be expressed like this. Maybe something to consider.

[CrazyStat]

Unlike library version numbers, the properties of a plastic bottle that might be of interest are not one-dimensional and monotonically increasing.

[cabaalis]

Create a recycling bureau that analyzes source materials and grades recycle-ability, and then in the law require certain grades for certain applications.