What is the expression prefix used to reference a constant?

The expression prefix used to reference a constant in Appian is "cons!". This prefix allows developers to easily access and use constants defined in their application. Constants are values that remain unchanged throughout the execution of the application and are often utilized for configuration settings or shared values which enhance maintainability and readability of code. By using the "cons!" prefix followed by the constant's name, developers can simply and effectively incorporate these constants into their expressions, facilitating clean and efficient application development.

The other prefixes serve different purposes. The "rule!" prefix is used to call rules defined in Appian, enabling developers to create reusable functional components. The "value!" prefix is associated with accessing specific field values from data objects or records. The "constant!" prefix does not exist within the framework, which further clarifies the correctness of the "cons!" prefix in referencing constants.