XPathAPI (Apache XML Security for Java 4.0.4 API)

```
public interface XPathAPI
```
An interface to abstract XPath evaluation

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Clear any context information from this object
`boolean`	`evaluate(Node contextNode, Node xpathnode, String str, Node namespaceNode)`	Evaluate an XPath string and return true if the output is to be included or not.
`NodeList`	`selectNodeList(Node contextNode, Node xpathnode, String str, Node namespaceNode)`	Use an XPath string to select a nodelist.

- Method Detail
  - selectNodeList
```
NodeList selectNodeList(Node contextNode,
                        Node xpathnode,
                        String str,
                        Node namespaceNode)
                 throws TransformerException
```
    Use an XPath string to select a nodelist. XPath namespace prefixes are resolved from the namespaceNode.
    
    Parameters:
    
    contextNode - The node to start searching from.
    
    xpathnode -
    
    str -
    
    namespaceNode - The node from which prefixes in the XPath will be resolved to namespaces.
    
    Returns:
    
    A NodeIterator, should never be null.
    
    Throws:
    
    TransformerException
  - evaluate
```
boolean evaluate(Node contextNode,
                 Node xpathnode,
                 String str,
                 Node namespaceNode)
          throws TransformerException
```
    Evaluate an XPath string and return true if the output is to be included or not.
    
    Parameters:
    
    contextNode - The node to start searching from.
    
    xpathnode - The XPath node
    
    str - The XPath expression
    
    namespaceNode - The node from which prefixes in the XPath will be resolved to namespaces.
    
    Throws:
    
    TransformerException
  - clear
```
void clear()
```
    Clear any context information from this object