Which types of objects can be called using the 'rule!' domain prefix?

Which types of objects can be called using the 'rule!' domain prefix?

• A. Decisions, expression rules, interfaces, and integrations
• B. Decisions, rules
• C. Interfaces and integrations
• D. Integrations only

Answer: (A)

Rule calls revolve around invoking rule-enabled objects to compute a value. In Appian, the rule! prefix isn’t limited to expression rules alone. It can call a range of rule-driven objects that expose a callable rule interface, including decision rules (which produce outcomes from inputs), interfaces (callable UI fragments or rule-backed UI logic), and integrations (rule-based calls to external systems). This unified mechanism lets you centralize logic and reuse it across different parts of the application. That’s why all four types—decisions, expression rules, interfaces, and integrations—can be called with the rule! prefix.

Rule calls revolve around invoking rule-enabled objects to compute a value. In Appian, the rule! prefix isn’t limited to expression rules alone. It can call a range of rule-driven objects that expose a callable rule interface, including decision rules (which produce outcomes from inputs), interfaces (callable UI fragments or rule-backed UI logic), and integrations (rule-based calls to external systems). This unified mechanism lets you centralize logic and reuse it across different parts of the application. That’s why all four types—decisions, expression rules, interfaces, and integrations—can be called with the rule! prefix.