A number of functions, including the following, can require a default syntax expression that is not part of a policy:
- Integrated Caching selectors:
- You define multiple non-compound expressions (selectlets) in the definition of the selector. Each selectlet is in an implicit logical AND relationship with the others.
- Load Balancing:
- You configure an expression for the TOKEN method of load balancing for a load balancing virtual server.
- Rewrite actions:
- Expressions define the location of the rewrite action and the type of rewriting to be performed, depending on the type of rewrite action that you are configuring. For example, a DELETE action only uses a target expression. A REPLACE action uses a target expression and an expression to configure the replacement text.
- Rate-based policies:
- You use default syntax expressions to configure Limit Selectors. You can use these selectors when configuring policies to throttle the rate of traffic to various servers. You define up to five non-compound expressions (selectlets) in the definition of the selector. Each selectlet is in an implicit logical AND with the others.