Query optimization for OLAP-XML federations
Proceedings of the 5th ACM international workshop on Data Warehousing and OLAP
Cost Modeling and Estimation for OLAP-XML Federations
DaWaK 2000 Proceedings of the 4th International Conference on Data Warehousing and Knowledge Discovery
Achieving adaptivity for OLAP-XML federations
DOLAP '03 Proceedings of the 6th ACM international workshop on Data warehousing and OLAP
Integrating XML Data in the TARGITOLAP System
ICDE '04 Proceedings of the 20th International Conference on Data Engineering
Evaluating XML-extended OLAP queries based on a physical algebra
Proceedings of the 7th ACM international workshop on Data warehousing and OLAP
Integrating heterogeneous data warehouses using XML technologies
Journal of Information Science
A relevance-extended multi-dimensional model for a data warehouse contextualized with documents
Proceedings of the 8th ACM international workshop on Data warehousing and OLAP
Warehousing the world: a few remaining challenges
Proceedings of the ACM tenth international workshop on Data warehousing and OLAP
Two approaches to the integration of heterogeneous data warehouses
Distributed and Parallel Databases
Contextualizing data warehouses with documents
Decision Support Systems
Integrating XML data in the TARGIT OLAP system
International Journal of Web Engineering and Technology
A relational–XML data warehouse for data aggregation with SQL and XQuery
Software—Practice & Experience
Algorithms for efficient structure-based grouping in XML-OLAP
Proceedings of the 10th International Conference on Information Integration and Web-based Applications & Services
What can hierarchies do for data streams?
BIRTE'06 Proceedings of the 1st international conference on Business intelligence for the real-time enterprises
Document-centric OLAP in the schema-chaos world
BIRTE'06 Proceedings of the 1st international conference on Business intelligence for the real-time enterprises
Finding an application-appropriate model for XML data warehouses
Information Systems
Business intelligence for small and middle-sized entreprises
ACM SIGMOD Record
Integrating different grain levels in a medical data warehouse federation
DaWaK'06 Proceedings of the 8th international conference on Data Warehousing and Knowledge Discovery
Integrating XML sources into a data warehouse
DEECS'06 Proceedings of the Second international conference on Data Engineering Issues in E-Commerce and Services
Multidimensional integrated ontologies: a framework for designing semantic data warehouses
Journal on Data Semantics XIII
On-demand multidimensional data integration: toward a semantic foundation for cloud intelligence
The Journal of Supercomputing
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The rapidly changing data requirements of today's dynamic business environments are not handled well by current On-Line Analytical Processing (OLAP) systems. Physically integrating data from new sources into OLAP systems is a long and time-consuming process, making logical integration the better choice in many situations. The increasing use of Extended Markup Language (XML), e.g. in business-to-business (B2B) applications, suggests that the required external data will most often be available in XML format.In this paper we present a theoretically well-founded approach to the logical federation of OLAP and XML data sources. The approach allows external XML data to be presented along with dimensional data in OLAP query results and enables the use of external XML data for selection and grouping. Special care is taken to ensure that semantic problems do not occur in the integration process. This opens up many new application areas for OLAP, e.g., inthe B2B and scientific domains. A number of effective optimization techniques for OLAP-XML federations are presented. Performance results from the prototype implementation show that the approach is an attractive alternative to physical integration. The approach is exemplified using a real-world case study from the B2B domain.