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CIKM
2008
Springer
13 years 9 months ago
2008
Springer
Answering queries over ontologies is an important issue for the Semantic Web. Aggregate queries were widely studied for relational databases but almost no results are known for ag...
BNCOD
2007
13 years 9 months ago
2007
The XQuery language is the standard query language for XML. The result of XQuery queries are typically XML documents in other formats. We introduce the term output schemas of an X...
DEBU
2008
13 years 7 months ago
2008
Query optimization is an inherently complex problem, and validating the correctness and effectiveness of a query optimizer can be a task of comparable complexity. The overall proc...
VLDB
2002
ACM
13 years 7 months ago
2002
ACM
Query optimization is a computationally intensive process, especially for complex queries. We present here a tool, called PLASTIC, that can be used by query optimizers to amortize...
CIKM
2010
Springer
13 years 5 months ago
2010
Springer
Query reformulation modifies the original query with the aim of better matching the vocabulary of the relevant documents, and consequently improving ranking effectiveness. Previou...