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## Package org.apache.commons.configuration.tree

A package with helper and utility classes used by hierarchical configurations.

See:
Description

Interface Summary
ConfigurationNode | Definition of an interface for the nodes of a hierarchical configuration.
ConfigurationNodeVisitor | Definition of a Visitor interface for a configuration node structure.
ExpressionEngine | Definition of an interface for evaluating keys for hierarchical configurations.

Class Summary
ConfigurationNodeVisitorAdapter | A simple adapter class that simplyfies writing custom node visitor implementations.
DefaultConfigurationKey | A simple class that supports creation of and iteration on configuration keys supported by a ``DefaultExpressionEngine`` object.
DefaultConfigurationNode | A default implementation of the `ConfigurationNode` interface.
DefaultConfigurationNode.SubNodes | An internally used helper class for managing a collection of sub nodes.
DefaultExpressionEngine | A default implementation of the `ExpressionEngine` interface providing the "native"e; expression language for hierarchical configurations.
NodeAddData | A simple data class used by ``ExpressionEngine`` to store the results of the `prepareAdd()` operation.
NodeCombiner | A base class for node combiner implementations.
OverrideCombiner | A concrete combiner implementation that is able to construct an override combination.
UnionCombiner | A specialized implementation of the `NodeCombiner` interface that constructs a union from two passed in node hierarchies.
ViewNode | A specialized node implementation to be used in view configurations.

## Package org.apache.commons.configuration.tree Description

A package with helper and utility classes used by hierarchical configurations.

$Id: package.html 439648 2006-09-02 20:42:10Z oheger $

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