The grammar supports arithmetic and mathematical operations:

    20 - 18
AS professional experience

Of course, variables or attributes from the schema can also be used within an arithmetic operation.

Let's look at the following scheme and two predefined variables:

age : 0

{
   age : 0
}

    18
AS career start
​
    age - career start
AS professional experience

Arithmetic expressions can be arbitrarily complex using parentheses:

    (20 - 18) * 12
AS professional experience in months

Arithmetic expressions can also be used directly within a rule:

    the professional experience from age - 18 years MUST NOT be LESS than 10 

​

Reference

Currently the following mathematical operations are supported: