In recent years, we have witnessed a revival of the use of recursive queries in a variety of emerging application domains such as data integration and exchange, information extraction, networking, and ...

Abstract: Recursive query is an interesting and subtle topic in XML query. Existing XML query languages often resort to recursive function or recursive predicate to present recursive XML query.

Query processing and optimization have been extensively researched for close to five decades now, and are implemented in all contemporary database systems. Nevertheless, important challenges remain ...