Predicate Operators

Used in PredicateExpression to test the state of a field (whether it has a value or is empty).

Operators

Behavior

IS_EMPTY

Evaluates to true when:

• Field value is null or undefined

• Field value is an empty string ("")

• Field value is an empty array ([])

• Field has not been set

IS_NOT_EMPTY

Evaluates to true when:

• Field contains any non-null value

• String fields have at least one character

• Array fields have at least one element

• Field has been set with a value

Field Reference

Predicate operators work with ProcessFieldValue references:

• Must reference an existing field in the current process

• Field value is retrieved at expression evaluation time

• Works with any field type

Usage

Used for:

• Required field validation

• Conditional workflow gating

• Data completeness checks

• Form validation rules

• Progressive disclosure (show/hide fields based on data presence)

• Process advancement conditions

Examples

Check if a field is empty:

IS_EMPTY(fieldName)

Check if a field has data:

IS_NOT_EMPTY(fieldName)

Combined with logical operators:

AND [
  IS_NOT_EMPTY(firstName),
  IS_NOT_EMPTY(lastName),
  IS_NOT_EMPTY(email)
]