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Smart cache expiration with Drupal Rules

I've been exploring Drupal Rules some more since last week.

We were already using it before to automate the various repetitive tasks involved in creating a new appliance (e.g., creating aliases for the feeds).

Intelligent caching

Now we're also using Rules in conjuction with the Cache Actions module to expire the cache page intelligently so that adding or removing published content expires related page caches immediately.