Mingzhu Wei Elke A. Rundensteiner Murali Mani Ming Li Processing recursive XQuery over XML streams: The Raindrop approach. 243-265 2008 65 Data Knowl. Eng. 2 http://dx.doi.org/10.1016/j.datak.2007.09.007 db/journals/dke/dke65.html#WeiRML08