XPathFunction

```
public interface XPathFunction
```
XPathFunction provides access to XPath functions.

Functions are identified by QName and arity in XPath.

Since:

1.5

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  Object evaluate(List args)
  Evaluate the function with the specified arguments.

- Method Detail
  - evaluate
```
Object evaluate(List args)
         throws XPathFunctionException
```
    Evaluate the function with the specified arguments.
    
    To the greatest extent possible, side-effects should be avoided in the definition of extension functions. The implementation evaluating an XPath expression is under no obligation to call extension functions in any particular order or any particular number of times.
    
    Parameters:
    
    args - The arguments, null is a valid value.
    
    Returns:
    
    The result of evaluating the XPath function as an Object.
    
    Throws:
    
    XPathFunctionException - If args cannot be evaluated with this XPath function.