NFQL: the natural forms query language
ACM Transactions on Database Systems (TODS)
HyPursuit: a hierarchical network search engine that exploits content-link hypertext clustering
Proceedings of the the seventh ACM conference on Hypertext
STRUDEL: a Web site management system
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Information gathering in the World-Wide Web: the W3QL query language and the W3QS system
ACM Transactions on Database Systems (TODS)
Database techniques for the World-Wide Web: a survey
ACM SIGMOD Record
Managing semistructured data with florid: a deductive object-oriented perspective
Information Systems - Special issue on semistructured data
WWW '99 Proceedings of the eighth international conference on World Wide Web
Schemas for web data: a reverse engineering approach
Data & Knowledge Engineering - Building web warehouse
Design and Maintenance of Data-Intensive Web Sites
EDBT '98 Proceedings of the 6th International Conference on Extending Database Technology: Advances in Database Technology
Queries and Computation on the Web
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Adding Structure to Unstructured Data
ICDT '97 Proceedings of the 6th International Conference on Database Theory
WebOQL: Restructuring Documents, Databases, and Webs
ICDE '98 Proceedings of the Fourteenth International Conference on Data Engineering
Structure-Based Queries over the World Wide Web
ER '98 Proceedings of the 17th International Conference on Conceptual Modeling
Locating Web Information Using Web Checkpoints
DEXA '99 Proceedings of the 10th International Workshop on Database & Expert Systems Applications
A Declarative Language for Querying and Restructuring the Web
RIDE '96 Proceedings of the 6th International Workshop on Research Issues in Data Engineering (RIDE '96) Interoperability of Nontraditional Database Systems
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We describe how to formulate a coupling query to glean relevant Web data in the context of our web warehousing system called WHOWEDA (Warehouse Of Web Data). Coupling query may be used for querying both HTML and XML documents. One of the important feature of our query mechanism is the ability to express conjunctive as well as disjunctive query conditions compactly. We describe how to formulate a coupling query in text form as well as pictorially using the coupling text and the coupling graph respectively. We explore the limitations of coupling graph with respect to the 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 introduce the notion of hybrid graph which is a special type of p-connected coupling graph. Finally, we discuss the implementation of a GUI-based system called VISCOUS (VISual COupling QUery System) for formulating such queries.