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
WebOQL: Restructuring Documents, Databases, and Webs
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
On Formulation of Disjunctive Coupling Queries in WHOWEDA
DEXA '01 Proceedings of the 12th International Conference on Database and Expert Systems Applications
On Formulation of Disjunctive Coupling Queries in WHOWEDA
DEXA '01 Proceedings of the 12th International Conference on Database and Expert Systems Applications
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Most of the contemporary web query systems has limited capabilities in imposing disjunctive constraints on the hyperlinked structure of Web documents. Such query facility is important because it gives us an opportunity to overcome the irregular and semistructured nature of the inter-document structure in the Web. In this paper, we describe a query mechanism called coupling query to address this issue in the context of our web warehousing system called Whoweda (Warehouse Of Web Data). We describe the syntax and semantics of the connectivities in a coupling query which enables us to impose disjunctive constraints on the inter-document structure. We describe two flavours of coupling query, i.e., canonical and non-canonical, and show how a noncanonical query can be transformed to a valid canonical query. Such transformation is useful for query evaluation.