| Package | Description | 
|---|---|
| org.apache.commons.configuration.tree | 
A package with helper and utility classes used by hierarchical configurations. | 
| org.apache.commons.configuration.tree.xpath | 
This package contains the implementation of the XPathExpressionEngine class, which
enables XPATH support for querying configuration properties. | 
| Modifier and Type | Method and Description | 
|---|---|
| NodeAddData | ExpressionEngine. prepareAdd(ConfigurationNode root,
          String key)Returns information needed for an add operation. | 
| NodeAddData | DefaultExpressionEngine. prepareAdd(ConfigurationNode root,
          String key)
 Prepares Adding the property with the specified key. | 
| Modifier and Type | Method and Description | 
|---|---|
| NodeAddData | XPathExpressionEngine. prepareAdd(ConfigurationNode root,
          String key)Prepares an add operation for a configuration property. | 
| Modifier and Type | Method and Description | 
|---|---|
| protected void | XPathExpressionEngine. initNodeAddData(NodeAddData data,
               String path)Initializes most properties of a  NodeAddDataobject. | 
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