Leaving a node value blank


im not sure where to post this thread but decided here anyway. For xml, there are some information that i need not display. Therefore, i have to leave that node value blank. However, when i display this in flash, it gave me “undefined”. when i change the node value to <nodevalue/>, this does not work either. Is there any method that i can use easily from database, to leave a node value blank and display in flash?