CoBase: a scalable and extensible cooperative information system
Journal of Intelligent Information Systems - Special issue on intelligent integration of information
Flexible queries over semistructured data
PODS '01 Proceedings of the twentieth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
XIRQL: a query language for information retrieval in XML documents
Proceedings of the 24th annual international ACM SIGIR conference on Research and development in information retrieval
Schema-Driven Evaluation of Approximate Tree-Pattern Queries
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
EDBT '02 Proceedings of the 8th International Conference on Extending Database Technology: Advances in Database Technology
Answering XML Queries on Heterogeneous Data Sources
Proceedings of the 27th International Conference on Very Large Data Bases
Selected papers from the Third International Workshop WebDB 2000 on The World Wide Web and Databases
Texquery: a full-text search extension to xquery
Proceedings of the 13th international conference on World Wide Web
Configurable indexing and ranking for XML information retrieval
Proceedings of the 27th annual international ACM SIGIR conference on Research and development in information retrieval
Adaptive Processing of Top-k Queries in XML
ICDE '05 Proceedings of the 21st International Conference on Data Engineering
Structure and content scoring for XML
VLDB '05 Proceedings of the 31st international conference on Very large data bases
Incremental controlled relaxation of failing flexible queries
Journal of Intelligent Information Systems
Tree patterns with full text search
Procceedings of the 13th International Workshop on the Web and Databases
An Integrated Query Relaxation Approach Adopting Data Abstraction and Fuzzy Relation
Journal of Database Management
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The heterogeneity nature of XML data creates the need for approximate query answering. In this paper, we present an XML system that cooperates with users to provide user-specific approximate query answering. The key features of the system include: 1) a query language that allows users to specify approximate conditions and relaxation controls; 2) a relaxation index structure, XTAH, that enables the system to provide user-desired relaxations as specified in the queries; and 3) a ranking model that incorporates both content and structure similarities in evaluating the relevancy of approximate answers. We evaluate our system with the INEX 05 test collections. The results reveal the expressiveness of the language, show XTAH's capability in providing user-desired relaxation control and demonstrate the effectiveness of the ranking model.