Grammar Rules

Learn about the syntax for commonly-used FEEL expressions through simple examples. For the complete definition of FEEL syntax, see Decision Model and Notation (DMN), v1.1.

Topics:

• Arithmetic Expressions

• Interval Expressions

• Comparison Expressions

• Other Expressions

Arithmetic Expressions

Name	FEEL Expression	Return Value
Addition (+)	0.15+30	30.15
Subtraction (-)	15-30	-15
Multiplication (*)	.20*40.02	8.004
Division (/)	1/50	0.02
Exponentiation (**)	2**3	8

Interval Expressions

Start Value	End Value	FEEL Expression	Return Value
Inclusive	Inclusive	15 in [15..30]	true
Exclusive	Exclusive	15 in (15..30)	false
Exclusive	Inclusive	30 in (15..30]	true
Inclusive	Exclusive	30 in [15..30)	false

Note:

In decision tablet input entry and input/output allowed value cells, you can use intervals or list of intervals to test against the input data.

Comparison Expressions

Name	FEEL Expression	Return Value
Less than (<)	8<2**3	false
Less than or equal to (<=)	15 in (<=15)	true
Equal (=)	8=2**3	true
Greater than (>)	30 in (>30)	false
Greater than or equal to (>=)	1/5>=0.20	true
Not equal to (!=)	8!=2**3	false

Note:

In decision table input entry and input/output allowed value cells, you can use comparison operators to define unary expressions.

Other Expressions

Name	FEEL Expression	Return Value
Disjunction	(2*2=2**2) or (3*2=3**2)	true
Conjunction	(2*2=2**2) and (3*2=3**2)	false
Negation	not(2*2=2**2)	false

Note:

In decision tablet input entry and input/output allowed value cells, you can use comma-separated list of values to specify disjunction.