Flexible and efficient XML search with complex full-text predicates

Recently, there has been extensive research that generated a wealth of new XML full-text query languages, ranging from simple Boolean search to combining sophisticated proximity and order predicates on keywords. While computing least common ancestors of query terms was proposed for efficient evaluation of conjunctive keyword queries by exploiting the document structure, no such solution was developed to evaluate complex full-text queries. We present efficient evaluation algorithms based on a formalization of full-text XML queries in terms of keyword patterns and an algebra which manipulates pattern matches. Our algebra captures most existing languages and their varying semantics and our algorithms combine relational query evaluation techniques with the exploitation of document structure to process queries with complex full-text predicates. We show how scoring can be incorporated into our framework without compromising the algorithms complexity. Our experiments show that considering el...

• Type: Conference
• Year: 2006
• Where: SIGMOD
• Authors: Sihem Amer-Yahia, Emiran Curtmola, Alin Deutsch
• Keywords: Complex Full-text Predicates, Complex Full-text Queries, Database, Full-text Xml Queries, SIGMOD 2006