Query Ranking in Probabilistic XML Data
Authors
- Lijun Chang (Chinese University of Hong Kong, China)
- Jeffrey Xu Yu (The Chinese Univ. of Hong Kong, China)
- Lu Qin (CUHK, China)
Abstract
Twig queries have been extensively studied as a major fragment of XPATH queries to query XML data. In this paper, we study PXML-RANK query, (Q, k), which is to rank top-k probabilities of the answers of a twig query Q in probabilistic XML (PXML) data. A new research issue is how to compute top-k probabilities of answers of a twig query Q in PXML in the presence of containment (ancestor/descendant) relationships. In the presence of the ancestor/descendant relationships, the existing dynamic programming approaches to rank top-k probabilities over a set of tuples cannot be directly applied, because any node/edge in PXML may have impacts on the top-k probabilities of answers. We propose new algorithms to compute PXML-RANK queries efficiently and give conditions under which a PXML-RANK query can be processed efficiently without enumeration of all the possible worlds. We conduct extensive performance studies using both real and large benchmark datasets, and confirm the efficiency of our algorithms.
Session
EDBT Research Session 5: XML, XPath, XQuery (Tuesday, March 24, 14:00—15:30)