| ArrayNode | Represents an Array node in the config tree. |
| BaseNode | The base node class |
| BooleanNode | This node represents a Boolean value in the config tree. |
| Processor | This class is the entry point for config normalization/merging/finalization. |
| PrototypedArrayNode | Represents a prototyped Array node in the config tree. |
| ScalarNode | This node represents a scalar value in the config tree. |
| VariableNode | This node represents a variable value in the config tree. |
Interfaces
| ConfigurationInterface | Configuration interface |
| NodeInterface | Common Interface among all nodes. |
| PrototypeNodeInterface | This interface must be implemented by nodes which can be used as prototypes. |