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The authors present Linkage Query Writer (LinQuer), a system for generating SQL queries for semantic link discovery over relational data. The LinQuer framework consists of LinQL, a language for specification of linkage requirements; a web interface and an API for translating LinQL queries to standard SQL queries; an interface that assists users in writing LinQL queries. They discuss the challenges involved in the design and implementation of a declarative and easy to use framework for discovering links between different data items in a single data source or across different data sources.
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