Friendly Enough Expression Language (FEEL) is a part of the DMN specification of the OMG. It is designed to write expressions for decision tables and literal expressions in a simple way that is easily understood by business professionals and developers.
FEEL has two entry points: unary-tests and expressions.
Unary-Tests can be used only for input entries of a decision table. They are a special kind of expression with a different grammar. The expression gets the value of the input expression implicitly as the first argument. The result of the expression must be either
< 7 // input less than 7 not(2,4) // input is not 2 or 4 [date("2015-09-17")..date("2015-09-19")] // input is between '2015-09-17' and '2015-09-19' <= duration("P1D") // input is less or equal one day
Expressions can be used everywhere (e.g. in a decision table as input expression or output entry). An expression takes no implicit arguments like unary-tests.
applicant.monthly.income * 12 if applicant.maritalStatus in ("M","S") then "valid" else "not valid" sum( [applicant.monthly.repayments, applicant.monthly.expenses] ) sum( credit_history[record_date > date("2011-01-01")].weight ) some ch in credit_history satisfies ch.event = "bankruptcy"