L. Popa

Publications91
h-index34
Citations5,925
Highly Influential Citations579
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Data exchange: semantics and query answering
TLDR
We give an algebraic specification that selects, among all solutions to the data exchange problem, a special class of solutions that we call universal. Expand
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Translating Web Data
TLDR
We present a novel framework for mapping between XML and relational schemas, in which a high-level, user-specified mapping is translated into semantically meaningful queries that transform source data into the target representation. Expand
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Data exchange: semantics and query answering
TLDR
We give an algebraic specification that selects, among all solutions to the data exchange problem, a special class of solutions that we call universal. Expand
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Clio grows up: from research prototype to industrial tool
TLDR
Clio, the IBM Research system for expressing declarative schema mappings, has progressed in the past few years from a research prototype into a technology that is behind some of IBM's mapping technology. Expand
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Composing Schema Mappings: Second-Order Dependencies to the Rescue
TLDR
We give a rigorous semantics to the composition of schema mappings in which the specification is given by a finite set of source-to-target tuple-generating dependencies and investigate the definability and computational complexity of the composition. Expand
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Data exchange: getting to the core
TLDR
Data exchange is the problem of taking data structured under a source schema and creating an instance of a target schema that reflects the source data as accurately as possible. Expand
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Nested mappings: schema mapping reloaded
TLDR
We present a new formalism for schema mapping that extends these existing formalisms in two significant ways. Expand
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Constraint-based XML query rewriting for data integration
TLDR
We study the problem of answering queries through a target schema, given a set of mappings between one or more source schemas, and given that the data is at the sources. Expand
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Towards a theory of schema-mapping optimization
TLDR
A schema mapping is a high-level specification that describes the relationship between two database schemas. Expand
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Query reformulation with constraints
TLDR
Let Σ<inf>1</inf>, Σ <inf>2</inf> be two schemas, which may overlap, and let <i>C</i> be a set of constraints on the joint schema. Expand
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  • PDF