Hajime Takekawa Hiroshi Ishikawa Incrementally-Updatable Stream Processors for XPath Queries based on Merging Automata via Ordered Hash-keys. 40-44 2007 conf/dexaw/2007 DEXA Workshops http://doi.ieeecomputersociety.org/10.1109/DEXA.2007.88 db/conf/dexaw/dexaw2007.html#TakekawaI07