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Change index.rst to README.rst

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Behavioral/Observer/README.md
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# Observer
## Purpose
To implement a publish/subscribe behaviour to an object, whenever a "Subject" object changes it's state, the attached
"Observers" will be notified. It is used to shorten the amount of coupled objects and uses loose coupling instead.
## Examples
* a message queue system is observed to show the progress of a job in a GUI
## Note
PHP already defines two interfaces that can help to implement this pattern: SplObserver and SplSubject.
## UML Diagram
![Alt Observer UML Diagram](uml/uml.png)

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Behavioral/Observer/index.rst → Behavioral/Observer/README.rst
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