The development of techniques and tools
to support transformations for different forms of heterogeneity and irregularities in
the data is an open problem of practical significance for the improvement of current
OLAP systems.
Acknowledgments.
This work was supported by Millennium Nucleus, Center for Web Research (P04-
067-F), Mideplan, Chile.
References
Abiteboul, S., & Vianu, V. (1999). Regular path queries with constraints. Journal
of Computer and System Science, 58(3), 428-452.
Buneman, P., Fan, W., & Weinstein, S. (1998). Path constraints on semistructured
and structured data. In Proceedings of the Seventeenth ACM Symposium on
Principles of Database Systems, New York (pp. 129-138).
6 Hurtado & Gutierrez
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of
Idea Group Inc. is prohibited.
Cabibbo, L., & Torlone, R. (1998). Querying multidimensional databases. In Proceedings
of the Sixth International Workshop on Database Programming
Languages, London (pp. 319-335).
Chatziantoniou, D., & Ross, K. A. (1996). Querying multiple features of groups
in relational databases. In Proceedings of the Twenty-Second International
Conference on Very Large Data Bases, San Francisco (pp. 295-306).
Goldstein, B. S. (1981). Constraints on null values in relational databases. In Proceedings
of the Seventh International Conference on Very Large Data Bases,
Cannes, France (pp.
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