[when][]is less than=<
[when][]is greater than=>
[when][]is equal to===
[when][]Given a person with=Person()
[when][]- {field:w*} {operator} {value:d*}={field} {operator} {value}

Given a person with
   - age is less than 18

'InOrNotIn.options' : ['contains=in', 'not contains=not in']

[when][]Given a currency "{operator:ENUM:InOrNotIn.options}" the major currencies
              = $ccy : Currency(isoCode {operator} $majorCurrencies)