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sparql

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White Papers

The Expressive Power of SPARQL

September 2, 2008 12:00am PDT

This paper studies the expressive power of SPARQL. The main result is that SPARQL and non-recursive safe Datalog with negation have equivalent expressive power, and hence, by classical results,...

Provided by: Springer Science+Business Media
White Papers

An Execution Environment for C-SPARQL Queries

March 26, 2010 12:00am PDT

Continuous SPARQL (C-SPARQL) is proposed as new language for continuous queries over streams of RDF data. It covers a gap in the Semantic Web abstractions which is needed for many emerging...

Provided by: Association for Computing Machinery
White Papers

Querying XML Data With SPARQL

January 31, 2010 12:00am PST

SPARQL is today the standard access language for Semantic Web data. In the recent years XML databases have also acquired industrial importance due to the widespread applicability of XML in the...

Provided by: Technical University of Crete
White Papers

On the Semantics of SPARQL

June 28, 2009 12:00am PDT

The Resource Description Framework (RDF) is the standard data model for representing information about World Wide Web resources. Jointly with its release as Recommendation of the W3C, the natural...

Provided by: Universidad de Chile
White Papers

Foundations of SPARQL Query Optimization

January 26, 2009 12:00am PST

The SPARQL query language is a recent W3C standard for processing RDF data, a format that has been developed to encode information in a machine readable way. The authors investigate the...

Provided by: University of Zurich
White Papers

Querying RDF Data Stored in DBMS: SPARQL to SQL Conversion

August 29, 2008 12:00am PDT

This paper discusses the design and implementation of a tool for SPARQL to SQL conversion. The converter receives a SPARQL query which is then parsed and analyzed. All three current approaches to...

Provided by: Yale University
White Papers

An Empirical Study of Real-World SPARQL Queries

March 25, 2011 12:00am PDT

Understanding how users tailor their SPARQL queries is crucial when designing query evaluation engines or ne-tuning RDF stores with performance in mind. In this paper the authors analyze 3 million...

Provided by: University of Valladolid
White Papers

nSPARQL: A Navigational Language for RDF

June 18, 2010 12:00am PDT

Navigational features have been largely recognized as fundamental for graph database query languages. This fact has motivated several authors to propose RDF query languages with navigational...

Provided by: Universidad de Chile
White Papers

Semantics and Complexity of SPARQL

May 26, 2006 12:00am PDT

SPARQL is the W3C candidate recommendation query language for RDF. In this paper the authors address systematically the formal study of SPARQL, concentrating in its graph pattern facility. They...

Provided by: Universidad de Talca
White Papers

Subqueries in SPARQL

March 1, 2011 12:00am PST

Subqueries are a powerful feature which allows enforcing reuse, composition, rewriting and optimization in a query language. In this paper the authors perform a comprehensive study of the...

Provided by: Universidad de Chile
White Papers

Reliable SPARQL Queries With Consistent Results Over P2P-Shared RDF Storage

November 19, 2010 12:00am PST

One aim of the semantic web is to build large knowledge bases distributed over the internet. Knowledge management systems that gather, merge and make available the information physically stored in...

Provided by: Politecnico di Torino
White Papers

Representing, Querying and Transforming Social Networks With RDF/SPARQL

April 8, 2009 12:00am PDT

As social networks are becoming ubiquitous on the Web, the Semantic Web goals indicate that it is critical to have a standard model allowing exchange, interoperability, transformation, and...

Provided by: Springer Science+Business Media
White Papers

Adding Data Mining Support to SPARQL Via Statistical Relational Learning Methods

March 17, 2008 12:00am PDT

Exploiting the complex structure of relational data enables to build better models by taking into account the additional information provided by the links between objects. The paper extends this...

Provided by: University of Zurich
White Papers

An Extension of SPARQL for RDFS

March 16, 2008 12:00am PDT

RDF Schema (RDFS) extends RDF with a schema vocabulary with a predefined semantics. Evaluating queries which involve this vocabulary is challenging, and there is not yet consensus in the Semantic...

Provided by: Universidad de Chile
White Papers

Semantic Retrieval Based on SPARQL and Fuzzy Ontology for Electronic Commerce

October 1, 2011 12:00am PDT

Information retrieval is the important work for Electronic Commerce. Ontology-based semantic retrieval is a hotspot of current research. In order to achieve fuzzy semantic retrieval, this paper...

Provided by: Academy Publisher
Articles

SPARQL: A query platform for Web 2.0 and the Semantic Web

July 20, 2006 6:48pm PDT

This document explains how SPARQL might be used for querying information in a Web 2.0 environment and how the SPARQL Protocol works for remote queries.

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White Papers

Constrained Regular Expressions in SPARQL

May 14, 2008 12:00am PDT

The authors have proposed an extension of SPARQL, called PSPARQL, to characterize paths of variable lengths in an RDF knowledge base (e.g. "Does there exist a trip from town A to town B?")....

Provided by: INRIA
White Papers

An Experimental Comparison of RDF Data Management Approaches in a SPARQL Benchmark Scenario

May 8, 2008 12:00am PDT

Efficient RDF data management is one of the cornerstones in realizing the Semantic Web vision. In the past, different RDF storage strategies have been proposed, ranging from simple triple stores...

Provided by: University of Freiburg
White Papers

Dynamic Querying of Mass-Storage RDF Data With Rule-Based Entailment Regimes

August 14, 2009 12:00am PDT

RDF Schema (RDFS) as a lightweight ontology language is gaining popularity and, consequently, tools for scalable RDFS inference and querying are needed. SPARQL has become recently a W3C standard...

Provided by: Università della Calabria
White Papers

Foundations of RDF Databases

April 15, 2009 12:00am PDT

The goal of this paper is to give an overview of the basics of the theory of RDF databases. The authors provide a formal definition of RDF that includes the features that distinguish this model...

Provided by: Universidad de Chile

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