This is a system inspired by Inkle's GDC talks for Heaven's Vault, 80 days, and Sorcery. This system will allow the game to query the states of the system to be able to make informed decisions on how to act, which dialog to display, or however else you may act on this knowledge.
For a complete breakdown and example of how to use this module, look
into the 'example.jai' and compile it using jai example.jai command.
One limitation to the system that isn't outlined in the example.jai is the lack of serializing the state of the system so it can be saved and restored. Because the games I've made up to this point haven't needed this functionality, it just hasn't been created. It is on the roadmap for my current project and will be added at a later date.