There are a number of Rule types—note that, more accurately, these are Data Types.
Some are listed below, with indications of their JavaScript syntax.
•Array: [1,2,3,4]
•Boolean: true/false
•File (indicates that the Rule will become a file in the Resources folder in the Project Editor)
•Number 2.2, 1.0006, etc.
•Integer 2
•String "This is a string"
•Point p(x,y,z)
•Frame
•Vector v(1,1,1)
•Model instance of a Design
•Any any type listed above; this is a placeholder that can be changed at any time