A recursive algebra and query optimization for nested relations
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
DEByE - Date extraction by example
Data & Knowledge Engineering
Query-by-example: a data base language
IBM Systems Journal
An XML approach to semantically extract data from HTML tables
DEXA'05 Proceedings of the 16th international conference on Database and Expert Systems Applications
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This paper proposes an approach for representing and querying semistructured Web data, which is based on nested tables allowing internal nested structural variations. Our motivation is to reduce the complexity found in typical query languages for semistructured data and to provide users with an alternative for quickly querying data obtained from multiple-record Web pages. We show the feasibility of our proposal by developing a prototype for a graphical query interface called QSByE (Querying Semistructured data By Example), which implements a set of QBE-like operations that extends typical nested-relational-algebra operations to handle semistructured data.