Mapping-based query generation with duplicate elimination and minimal union
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United States of America Patent
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Mar 31, 2009
Grant Date -
Jul 26, 2007
app pub date -
Jan 6, 2006
filing date -
Jan 6, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for generating a query implementing a schema mapping. A mapping M is provided from a schema S to a schema T, where M relates S to T, and M includes a plurality of constraints. Schemas S and T each include one or more elements, and T includes at least one set type element. Mapping M is expressed in terms of at least one nested tuple-generating dependency. A query Q is generated where Q is capable of applying M to an input instance I to result in an output instance J, where I conforms to S, J conforms to T, and I and J satisfy the plurality of constraints. Instance J is in partitioned normal form (i.e., satisfies minimal union semantics) and includes no duplicate element instances.
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