code: protected Element[] calculateArgs(Context context)
  			throws EvaluationException {
  
  		Element[] results = new Element[ops.length];
  		for (int i = 0; i < ops.length; i++) {
  			results[i] = ops[i].execute(context);
  		}
  
  		return results;
  	}
docs: A utility method which calls <code>execute</code> on each of this
  operation's arguments and returns an array of the results.
  
  @param context
  evaluation context to use
  
  @return array of the results of executing the arguments