SPARQL query
SPARQL query processing with conventional relational database systems
... for SPARQL queries over its in-memory and on-disk stores, but does not have a query engine that translates into relational expressions in the way that 3store and sparql2sql ...and SPARQL query ...
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Evaluation of SPARQL query generation from natural language questions
... each query and determined whether or not it accurately represented the orig- inal natural language ...disambiguation, SPARQL query construction, and the answers ...the SPARQL Assist system. ...
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Title: A SPARQL QUERY GENERATION MECHANISM ON RDF
... data. SPARQL queries are able to retrieve more relevant results than general keyword routing on RDF ...to SPARQL queries on a federation of different ...semantic query languages like RQL, ...
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SPARQL QUERY OPTIMIZATION CATEGORIES: A BRIEF SURVEY
... of SPARQL query rewriting, (b) modeling of the mappings between a source ontology and the target ontologies, (c) rewriting of the SPARQL queries posed over a source ontology in terms of the target ...
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SPARQL Query Optimization for Structural Indexed RDF Data
... effective query optimizer to solve the challenges of data indexing and query optimization, ...for SPARQL query ...For query processing, an effective query optimization mechanism ...
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Parallel SPARQL Query Execution using Apache Spark
... Recently, several large-scale graph processing frameworks have emerged for graph analytics in a shared-nothing cluster (e.g., Pregel [12], GraphLab [13], GraphX [14], Flink [15]). These frameworks can handle graphs with ...
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Ontology reasoning using SPARQL query: A case study of e-learning usage
... a query for RDF/OWL, used to retrieve the data that is written using RDF/OWL or ...This query uses an URI to retrieve the structure or information of ...RDF/OWL. SPARQL query language is ...
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An Approach for Query Decomposition on Federated SPARQL Query Systems
... Traditional query rewriting approaches do not allow performing incomplete translations of a BGP, ...original query, but also collecting complementary information and further applying a data fusion process ...
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SECF: Improving SPARQL Querying Performance with Proactive Fetching and Caching
... average query time and space ...Adaptive SPARQL Query Cache (ASQC) introduced in [9] (Section ...on SPARQL Endpoint server, we moni- tored server workload and give our observation ...two ...
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Benchmarking Bottom-Up and Top-Down Strategies for SPARQL-to-SQL Query Translation
... a SPARQL query, and even a relational engine that evaluates translated ...optimizing SPARQL queries and defining heuristics for choosing a “good” translation strategy for a SPARQL ...
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Ontop: answering SPARQL queries over relational databases
... the information needs in the modeled scenario. The on- tology and mappings contain thousands of axioms and rules and our benchmark comes with a dataset of up to 4 billion triples, which were obtained from the original ...
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Processing SPARQL queries with regular expressions in RDF databases
... (bio2rdf.org), SPARQL - a W3C recommendation query for RDF databases - has become an important query language for querying the bioinformatics knowledge ...the SPARQL query with regular ...
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Query Performance Appraisal using SPARQL & Map Reduce Technique on Web Semantics
... the SPARQL query execution over a distributed RDF dataset to achieve Performance ...distributed SPARQL query engine using MapReduce (introduced by Google), which is a proven parallelization ...
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How Interlinks Influence Federated over SPARQL Endpoints
... available SPARQL endpoints increases. SPARQL endpoints conceptually represent RPC-style, coarse-grained data access ...entities, SPARQL endpoints should be able to over distinct advantages over plain ...
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Making UIMA Truly Interoperable with SPARQL
... The SPARQL query that performs that conversion is shown in Figure 5. In the WHERE clause, for each ace:Event, patterns select ace:EventMentions and for each ace:EventMention, ace:EventMentionArguments are ...
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A Comprehensive Comparative study of SPARQL and SQL
... The SparQL query engine will return an exhaustive list of the subject component of triples that satisfy each query through value ...the query engine will attempt to match using components from ...
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SPARQLGX: Efficient Distributed Evaluation of SPARQL with Apache Spark
... Abstract. sparql is the w3c standard query language for querying data expressed in the Resource Description Framework ( rdf ...distributed sparql query eval- ...evaluating sparql ...
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Efficient handling of SPARQL OPTIONAL for OBDA
... each SPARQL query, we computed two SQL ...unfolded query only the stan- dard (previously known and widely adopted) structural and semantic optimisations [4] as well as CFR ...SQL query in BSBM ...
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Advanced SPARQL querying in small molecule databases
... The SPARQL query language has been introduced as a means to query data ...During query evaluation, solution mappings— mappings from the pattern variables to resources for which triples exist ...
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Peer based query rewriting in SPARQL for semantic integration of linked data
... process SPARQL queries without generating rewritings. SemLAV executes the query against a partial instance of the global schema which is built on-the-fly with data from the relevant ...dress query ...
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