Integrated Caching and System policies were developed on the Citrix ADC advanced policy infrastructure (also known as Default Syntax) and do not have classic policy equivalents. Integrated Caching policies are used to determine which requests and responses the appliance caches. System policies are used to manage traffic at a global level, such as for session management or rate limiting. Configuration for both of these policy types requires the use of advanced policy expressions. In contrast, older features like DNS and SSL support both classic and the newer advanced policy expressions for backward compatibility and transition.

A. DNS: DNS policies can be configured using both classic and advanced policy expressions, so they are not restricted to "only" advanced expressions.

C. SSL: SSL policies also support both classic and advanced policy expressions, allowing administrators to use either syntax for configuration.

1. Citrix Product Documentation

"Integrated Caching": "The integrated caching feature uses the new policy infrastructure. Therefore

you must use advanced policy expressions when you configure caching policies."

Source: Citrix ADC 13.1 Product Documentation

Section: Optimization > Integrated Caching > Configuring a Caching Policy.

2. Citrix Product Documentation

"System Policies and Expressions": The documentation for System policies exclusively describes and provides examples using the advanced policy syntax (Default Syntax). The command add system policy requires an advanced expression for the -rule parameter

with no classic alternative provided for this policy type.

Source: Citrix ADC 13.1 Product Documentation

Section: System > System Policies and Expressions.

3. Citrix Product Documentation

"Policies and Expressions": This documentation outlines the two types of policy syntax. It implicitly and explicitly shows that features like DNS and SSL have classic policy counterparts

while newer features were built directly on the advanced policy engine.

Source: Citrix ADC 13.1 Product Documentation

Section: AppExpert > Policies and Expressions > Introduction to Policies and Expressions.