Information gathering in the World-Wide Web: the W3QL query language and the W3QS system
ACM Transactions on Database Systems (TODS)
WWW '99 Proceedings of the eighth international conference on World Wide Web
Proceedings of the 3rd ACM international workshop on Data warehousing and OLAP
WebOQL: Restructuring Documents, Databases, and Webs
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
Imposing Disjunctive Constraints on Inter-document Structure
DEXA '01 Proceedings of the 12th International Conference on Database and Expert Systems Applications
Imposing Disjunctive Constraints on Inter-document Structure
DEXA '01 Proceedings of the 12th International Conference on Database and Expert Systems Applications
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We describe how to formulate coupling query to glean relevant Web data in the context of our web warehousing system called WHOWEDA (Warehouse Of Web Data). One of the important feature of our query mechanism is the ability to express disjunctive query conditions compactly. We describe how to formulate coupling queries in text form as well as pictorially using coupling text and coupling graph. We explore the limitations of coupling graph with respect to coupling text. We found out that AND, OR and AND/OR-coupling graphs are less expressive than their textual counterparts. To address this shortcoming we introduced another query formulation technique called hybrid graph which is a special type of p-connected coupling graph.