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Rules builds upon on its own API, which allows contributed modules to provide
- default rules, fixed or customizable
- further rule sets, fixed or customizable
- actions, which may be configurable
- conditions, which may also be configurable
- new events, for which conditions and actions can be configured
- new input evaluators (like token and PHP input evaluators)
- new rules data types
- user interfaces
Furthermore the API supports
- multiple arguments, for actions as well as for conditions
- configuration of actions/conditions for every event and rule set, where the necessary arguments are available. Action writers don't have to care about action compatibility.
- dynamic loading of needed arguments
- condition evaluation which supports logical operations like OR and AND
- negating conditions or logical operations
- ordered execution of conditions, actions and rules, controlled with weights
- a flexible input evaluation system (token, php, ..)
- packing and unpacking arguments, used e.g. for scheduling rule set execution
- building simple/complex interfaces, like rules admin ui or transformations