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+# Attribut
+This folder containes the attributs which are used by entity, domain logic etc.
+# Structure
+Each attribut containes out of an interface and a trait.
+## Interface
+The interface MUST define a __get-__ and a __set-method__. Optional an interface can define a __has-method__.
+### Methods
+#### Set
+The __setter__ MUST return nothing(void). It SHOULD throw an exception if the value is not valid.
+#### Get
+The __getter__ MUST return the attribute. Void is not allowed.
+#### Has
+__has__ must return an boolean. True if the attribut is defined, otherwise false.
+## Trait
+The trait represents the implementation of the interface. Also it contains an __private__ or __protected__ attribute, which is modified by the methods which are defined in the interface.