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- item-3 hasContent stefan-dietze.
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- 5 creator bhavani-thuraisingham.
- 5 creator jyothsna-rachapalli.
- 5 creator murat-kantarcioglu.
- 5 creator vaibhav-khadilkar.
- 5 type InProceedings.
- 5 label "RETRO: A Framework for Semantics Preserving SQL-to-SPARQL Translation".
- 5 sameAs 5.
- 5 abstract "There have been several attempts to make RDBMS and RDFstores inter-operate. The most popular one, D2RQ, has explored onedirection i.e. to look at RDBMS through RDF lenses. In this paper wepresent RETRO, which investigates the reverse direction i.e. to look atRDF through Relational lenses. RETRO generates a relational schemafrom an RDF store, enabling a user to query RDF data using SQL.A significant advantage of this direction in-addition to interoperabilityis that it makes numerous relational tools developed over past severaldecades, available to the RDF stores. In order to provide interoperabilitybetween these two DB systems one needs to resolve the heterogeneitybetween their respective data models and include schema mapping, datamapping and query mapping in the transformation process [1]. However,like D2RQ, RETRO chooses not to physically transform the data anddeals only with schema mapping and query mapping. RETRO’s schemamapping derives a domain specific relational schema from RDF dataand its query mapping transforms an SQL query over the schema into aprovably equivalent SPARQL query, which in-turn is executed upon theRDF store. Since RETRO is a read-only framework, its query mappinguses only a relevant and relationally complete subset of SQL. A proofof correctness of this transformation is given based on compositionalsemantics of the two query languages.".
- 5 hasAuthorList authorList.
- 5 isPartOf proceedings.
- 5 keyword "Database Interoperability".
- 5 keyword "Query Translation".
- 5 keyword "RDBMS".
- 5 keyword "RDF".
- 5 keyword "SPARQL".
- 5 keyword "SQL".
- 5 keyword "Semantic Web".
- 5 title "RETRO: A Framework for Semantics Preserving SQL-to-SPARQL Translation".
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- item-1 hasContent jyothsna-rachapalli.
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- item-2 hasContent vaibhav-khadilkar.
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- item-3 hasContent murat-kantarcioglu.
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- item-4 hasContent bhavani-thuraisingham.
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- 7 creator claus-pahl.
- 7 creator muhammad-javed.
- 7 creator yalemisew-abgaz.
- 7 type InProceedings.
- 7 label "Graph-based Discovery of Ontology Change Patterns".
- 7 sameAs 7.
- 7 abstract "Ontologies can support a variety of purposes, ranging fromcapturing conceptual knowledge to the organisation of digital contentand information. However, information systems are always subject tochange and ontology change management can pose challenges. We investigateontology change representation and discovery of change patterns.Ontology changes are formalised as graph-based change logs. We useattributed graphs, which are typed over a generic graph with node andedge attribution.We analyse ontology change logs, represented as graphs,and identify frequent change sequences. Such sequences are applied as a reference in order to discover reusable, often domain-specific and usage driven change patterns. We describe the pattern discovery algorithms and measure their performance using experimental results.".
- 7 hasAuthorList authorList.
- 7 isPartOf proceedings.
- 7 keyword "Change Log Graph.".
- 7 keyword "Ontology Change Representation".
- 7 keyword "Ontology Evolution".
- 7 keyword "Pattern Discovery Algorithm".
- 7 title "Graph-based Discovery of Ontology Change Patterns".
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- item-1 hasContent muhammad-javed.
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- 9 creator gerhard-friedrich.
- 9 creator kostyantyn-shchekotykhin.
- 9 creator patrick-rodler.
- 9 creator philipp-fleiss.
- 9 type InProceedings.
- 9 label "Balancing brave and cautious query strategies in ontology debugging".
- 9 sameAs 9.
- 9 abstract "Sequential ontology debugging aims to the efficient discrimination between diagnoses. By querying additional information the debugger can gradually reduce the number of diagnoses to be considered by the user. The selection of the best queries is of central importance for minimizing diagnosis costs. If prior fault probabilities are available, the best results are achieved by entropy based selection methods.However, given some weakly justified priors these methods bravely suggest suboptimal queries. In such a case, it is more efficient to use a no-risk method which prefers queries that eliminate 50% of diagnoses independently of any fault probabilities. However, choosing the appropriate method in advance is impossible because the quality of given priors cannot be assessed before additional information is queried.In this paper we propose a method which combines advantages of both approaches. On the one hand the method takes into account available fault probabilities and the user".
- 9 hasAuthorList authorList.
- 9 isPartOf proceedings.
- 9 keyword "description logic".
- 9 keyword "diagnosis".
- 9 keyword "ontology debugging".
- 9 keyword "query selection".
- 9 title "Balancing brave and cautious query strategies in ontology debugging".
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- item-1 hasContent patrick-rodler.
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