Cascading Configuration Design Pattern

I have not been able to find simple plain-language descriptions of what the Cascading Configuration Design Pattern is. And really not that many complicated descriptions either.

Basically, this pattern is used to simplify very complicated configuration problems, by simplifying what would be a matrix of configuration decisions into a "cascade" of configurations using a hierarchy. In different systems this pattern has different names including:

• Layer Overrides
• Hierarchical Configuration
• Configuration Inheritance

All of these names refer to the same underlying design pattern: A system of configurations where the executed configuration is made dynamically by allowing inner/local/later configuration rules to override the outer/global/earlier layers of the configuration using deterministic rules.

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