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- Flags. Flags store Boolean values. Operations on flags allow the flag to be set or cleared.
- Counters. Counters store numeric values. Operations on counters allow them to be incremented, decremented, and tested.
- Trails. Trails function like stacks. Operations on trails allow values to be pushed onto the trail, forgotten, and tested. (The name trail is historical. As originally envisioned, trails were used to keep track of the URLs an entity visited.)
- Literals. Literals can be numbers, strings, arrays, or maps, and admit operations on those values.
The following section show how persistent variables are used in various parts of a rule.
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