Results 1 - 10 of 12,558

The Lorel Query Language for Semistructured Data

by Serge Abiteboul, Dallan Quass, Jason Mchugh, Jennifer Widom, Janet Wiener - International Journal on Digital Libraries , 1997
"... We present the Lorel language, designed for querying semistructured data. Semistructured data is becoming more and more prevalent, e.g., in structured documents such as HTML and when performing simple integration of data from multiple sources. Traditional data models and query languages are inapprop ..."
Abstract - Cited by 731 (29 self) - Add to MetaCart
We present the Lorel language, designed for querying semistructured data. Semistructured data is becoming more and more prevalent, e.g., in structured documents such as HTML and when performing simple integration of data from multiple sources. Traditional data models and query languages

Constraint Query Languages

by Paris C. Kanellakis , Gabriel M. Kuper, Peter Z. Revesz , 1992
"... We investigate the relationship between programming with constraints and database query languages. We show that efficient, declarative database programming can be combined with efficient constraint solving. The key intuition is that the generalization of a ground fact, or tuple, is a conjunction ..."
Abstract - Cited by 372 (43 self) - Add to MetaCart
We investigate the relationship between programming with constraints and database query languages. We show that efficient, declarative database programming can be combined with efficient constraint solving. The key intuition is that the generalization of a ground fact, or tuple, is a conjunction

A Query Language for XML

by Alin Deutsch, Mary Fernandez, Daniela Florescu, Alon Levy, Dan Suciu , 1998
"... An important application of XML is the interchange of electronic data (EDI) between multiple data sources on the Web. As XML data proliferates on the Web, applications will need to integrate and aggregate data from multiple source and clean and transform data to facilitate exchange. Data extraction, ..."
Abstract - Cited by 340 (22 self) - Add to MetaCart
, conversion, transformation, and integration are all well-understood database problems, and their solutions rely on a query language. We present a query language for XML, called XML-QL, which we argue is suitable for performing the above tasks. XML-QL is a declarative, "relational complete" query

The Temporal Query Language TQuel

by Richard Snodgrass, Santiago Gomez, Richard Snodgrass, Santiago Gomez - ACM Transactions on Database Systems , 1987
"... This paper defines aggregates in the temporal query language TQuel and provides their rormal semantics in the tuple relational calculus. A rormal semantics (or Que! aggregates is defined in the process. Multiple aggregates; aggregates appearing in the where, when, valid, and as-or clauses; nested ag ..."
Abstract - Cited by 332 (45 self) - Add to MetaCart
This paper defines aggregates in the temporal query language TQuel and provides their rormal semantics in the tuple relational calculus. A rormal semantics (or Que! aggregates is defined in the process. Multiple aggregates; aggregates appearing in the where, when, valid, and as-or clauses; nested

A Query Language and Optimization Techniques for Unstructured Data

by Peter Buneman, Susan Davidson, Gerd Hillebrand, Dan Suciu , 1996
"... A new kind of data model has recently emerged in which the database is not constrained by a conventional schema. Systems like ACeDB, which has become very popular with biologists, and the recent Tsimmis proposal for data integration organize data in tree-like structures whose components can be used ..."
Abstract - Cited by 407 (35 self) - Add to MetaCart
equally well to represent sets and tuples. Such structures allow great flexibility in data representation What query language is appropriate for such structures? Here we propose a simple language UnQL for querying data organized as a rooted, edge-labeled graph. In this model, relational data may

Naturally Embedded Query Languages

by Val Breazu-tannen, Peter Buneman, Limsoon Wong - LNCS 646: Proceedings of 4th International Conference on Database Theory , 1992
"... We investigate the properties of a simple programming language whose main computational engine is structural recursion on sets. We describe a progression of sublanguages in this paradigm that (1) have increasing expressive power, and (2) illustrate robust conceptual restrictions thus exhibiting inte ..."
Abstract - Cited by 138 (28 self) - Add to MetaCart
interesting additional properties. These properties suggest that we consider our sublanguages as candidates for "query languages". Viewing query languages as restrictions of our more general programming language has several advantages. First, there is no "impedance mismatch" problem

The CQL Continuous Query Language: Semantic Foundations and Query Execution

by Arvind Arasu, Shivnath Babu, Jennifer Widom - VLDB Journal , 2003
"... CQL, a Continuous Query Language, is supported by the STREAM prototype Data Stream Management System at Stanford. CQL is an expressive SQL-based declarative language for registering continuous queries against streams and updatable relations. We begin by presenting an abstract semantics that relie ..."
Abstract - Cited by 354 (4 self) - Add to MetaCart
CQL, a Continuous Query Language, is supported by the STREAM prototype Data Stream Management System at Stanford. CQL is an expressive SQL-based declarative language for registering continuous queries against streams and updatable relations. We begin by presenting an abstract semantics

XQuery: An XML query language

by D. Chamberlin , 2002
"... This paper explains the need for an XML query language, provides a tutorial overview of XQuery, and includes several examples of its use ..."
Abstract - Cited by 58 (1 self) - Add to MetaCart
This paper explains the need for an XML query language, provides a tutorial overview of XQuery, and includes several examples of its use

Query Languages

by Alberto Téllez, Antonio Juárez, Gustavo Hernández, Claudia Denicia, Esaú Villatoro, Manuel Montes, Luis Villaseñor, Laboratorio De Tecnologías Del Lenguaje
"... This paper describes the system developed by the Language Technologies Lab of INAOE for the Spanish Question Answering task at CLEF 2007. The presented system is centered in a full datadriven architecture that uses information retrieval and machine learning techniques to identify the most probable a ..."
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This paper describes the system developed by the Language Technologies Lab of INAOE for the Spanish Question Answering task at CLEF 2007. The presented system is centered in a full datadriven architecture that uses information retrieval and machine learning techniques to identify the most probable

Query Languages.

by unknown authors
"... [1] S.Spaccapietra, C.Parent, M.Damiani and J.Macedo. A conceptual View on Trajectories ..."
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[1] S.Spaccapietra, C.Parent, M.Damiani and J.Macedo. A conceptual View on Trajectories
Results 1 - 10 of 12,558