code: public XObject execute(
            XPathContext xctxt, int currentNode, DTM dtm, int expType)
              throws javax.xml.transform.TransformerException
    {
  
      // For now, the current node is already pushed.
      return execute(xctxt);
    }
docs: Execute an expression in the XPath runtime context, and return the
  result of the expression.
  
  
  @param xctxt The XPath runtime context.
  @param currentNode The currentNode.
  @param dtm The DTM of the current node.
  @param expType The expanded type ID of the current node.
  
  @return The result of the expression in the form of a <code>XObject</code>.
  
  @throws javax.xml.transform.TransformerException if a runtime exception
  occurs.