XML-GL: a graphical language for querying and restructuring XML documents
WWW '99 Proceedings of the eighth international conference on World Wide Web
On optimizing an SQL-like nested query
ACM Transactions on Database Systems (TODS)
Proceedings of the 10th international conference on World Wide Web
On supporting containment queries in relational database management systems
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
XRel: a path-based approach to storage and retrieval of XML documents using relational databases
ACM Transactions on Internet Technology (TOIT)
Holistic twig joins: optimal XML pattern matching
Proceedings of the 2002 ACM SIGMOD international conference on Management of data
Query processing of streamed XML data
Proceedings of the eleventh international conference on Information and knowledge management
Algebraic XML Construction and its Optimization in Natix
World Wide Web
Data Cube: A Relational Aggregation Operator Generalizing Group-By, Cross-Tab, and Sub-Total
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Relational Databases for Querying XML Documents: Limitations and Opportunities
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
EDBT '02 Proceedings of the Worshops XMLDM, MDDE, and YRWS on XML-Based Data Management and Multimedia Engineering-Revised Papers
GLASS: A Graphical Query Language for Semi-Structured Data
DASFAA '03 Proceedings of the Eighth International Conference on Database Systems for Advanced Applications
Accelerating XPath evaluation in any RDBMS
ACM Transactions on Database Systems (TODS)
Extending XQuery for analytics
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
A Complete and Efficient Algebraic Compiler for XQuery
ICDE '06 Proceedings of the 22nd International Conference on Data Engineering
Strategies for query unnesting in XML databases
ACM Transactions on Database Systems (TODS)
Efficiently Querying Large XML Data Repositories: A Survey
IEEE Transactions on Knowledge and Data Engineering
The NEXT framework for logical XQuery optimization
VLDB '04 Proceedings of the Thirtieth international conference on Very large data bases - Volume 30
Efficient XQuery Evaluation of Grouping Conditions with Duplicate Removals
XSym '07 Proceedings of the 5th international Symposium on XML Database: Database and XMLTechnologies
VERT: a semantic approach for content search and content extraction in XML query processing
ER'07 Proceedings of the 26th international conference on Conceptual modeling
Real-time data warehousing for business intelligence
Proceedings of the 8th International Conference on Frontiers of Information Technology
A survey on XML streaming evaluation techniques
The VLDB Journal — The International Journal on Very Large Data Bases
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Since more and more business data are represented in XML format, there is a compelling need of supporting analytical operations in XML queries. Particularly, the latest version of XQuery proposed by W3C, XQuery 1.1, introduces a new construct to explicitly express grouping operation in FLWOR expression. Existing works in XML query processing mainly focus on physically matching query structure over XML document. Given the explicit grouping operation in a query, how to efficiently compute grouping and aggregate functions over XML document is not well studied yet. In this paper, we extend our previous XML query processing algorithm, VERT, to efficiently perform grouping and aggregate function in queries. The main technique of our approach is introducing relational tables to index values. Query pattern matching and aggregation computing are both conducted with table indices. We also propose two semantic optimizations to further improve the query performance. Finally we present experimental results to validate the efficiency of our approach, over other existing approaches.