ExpressionAction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface ExpressionAction
```
General action class which can be used to process all nodes on an expression tree

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  boolean process(Expression expression, java.lang.Object result)
  Process an expression

- Method Detail
  - process
```
boolean process(Expression expression,
                java.lang.Object result)
         throws XPathException
```
    Process an expression
    
    Parameters:
    
    expression - the expression to be processed
    
    result - supplied value (of an appropriate type!) which can be updated to return results
    
    Returns:
    
    true if processing is now complete and further expressions do not need to be processed
    
    Throws:
    
    XPathException - if a failure occurs