The Camunda DMN engine supports the following FEEL data types.

String

FEEL supports Strings. They must be encapsulated in double quotes. Theysupport only the equal comparison operator.

Numeric Types

FEEL supports numeric types like integer. In the Camunda DMN engine thefollowing numeric types are available:

• integer
• long
• double
  Numeric types support all comparison operators and ranges.

Boolean

FEEL supports the boolean value true and false. The boolean type onlysupports the equal comparison operator.

Date

FEEL supports date types. In the Camunda DMN engine the following date typesare available:

• date and time
  To create a date and time value, the function date and time has to be usedwith a single String parameter. The parameter specifies the date and time inthe format yyyy-MM-dd'T'HHss.

Date types support all comparison operators and ranges.

原文: https://docs.camunda.org/manual/7.9/reference/dmn11/feel/data-types/