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Rules extends Entity API and provides uniform access to Drupal's data types and instances.
By using pluggable wrappers for data types and properties, as well as its mechanics for executions (events, conditions, actions, logic operations), Rules provides a comprehensive approach for building (re)configurable programs.
For example, in Rules's Admin UI, data from diverse set of resources is presented in a clean, yet rich interface, for programmers of all skill levels to extend Drupal.
This section describes how to work with data.