What Is Declare Expression in Pega

Declare Expression is one among the four main types of declarative rules in Pega which target a single property either to obtain its value or to validate the value.

What is declarative rule?

Declarative Processing: Automatic calling and execution of rules by process commander. We create declarative rule and leave them without referring from any other rule. These rules gets auto executed when we used the properties which are involved in declarative rules.

What is backward chaining in PEGA?

Backward chaining executes declare expression rules when a value is needed for a property, as opposed to when inputs change. For example, a value may be needed because a property’s value is referenced in an HTML stream for display.