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- item-2 hasContent suvodeep-mazumdar.
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- item-3 hasContent aba-sah-dadzie.
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- 347 creator bernhard-schandl.
- 347 type InProceedings.
- 347 label "Functions over RDF Language Elements".
- 347 sameAs 347.
- 347 abstract "RDF data are usually accessed using one of two methods: either, graphs are rendered in forms perceivable by human users (e.g., in tabular or in graphical form), which are difficult to handle for large data sets. Alternatively, query languages like SPARQL provide means to express information needs in structured form; hence they are targeted towards developers and experts. Inspired by the concept of spreadsheet tools, where users can perform relatively complex calculations by splitting formulas and values across multiple cells, we have investigated mechanisms that allow us to access RDF graphs in a more intuitive and manageable, yet formally grounded manner. In this paper, we make three contributions towards this direction. First, we present RDFunctions, an algebra that consists of mappings between sets of RDF language elements (URIs, blank nodes, and literals) under consideration of the triples contained in a background graph. Second, we define a syntax for expressing RDFunctions, which can be edited, parsed and evaluated. Third, we discuss Tripcel, an implementation of RDFunctions using a spreadsheet metaphor. Using this tool, users can easily edit and execute function expressions and perform analysis tasks on the data stored in an RDF graph.".
- 347 hasAuthorList authorList.
- 347 hasTopic Semantic_Web.
- 347 isPartOf proceedings.
- 347 title "Functions over RDF Language Elements".
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- item-1 hasContent bernhard-schandl.
- 360 creator bernhard-steffen.
- 360 creator christian-kubczak.
- 360 creator daniel-meyer.
- 360 creator malte-isberner.
- 360 creator tiziana-margaria.
- 360 type InProceedings.
- 360 label "Synthesizing Semantic Web Service Compositions with jMosel and Golog".
- 360 sameAs 360.
- 360 abstract "In this paper we investigate different technologies to attack the automatic solution of orchestration problems based on synthesis from declarative specifications, a semantically enriched description of the services, and a collection of services available on a testbed. In addition to our previously presented tableaux-based synthesis technology, we consider two structurally rather different approaches here: using jMosel, our tool for Monadic Second-Order Logic on Strings and the high-level programming language Golog, that internally makes use of planning techniques. As a common case study we consider the Mediation Scenario of the Semantic Web Service Challenge, which is a benchmark for process orchestration. All three synthesis solutions have been embedded in the jABC/jETI modeling framework, and used to synthesize the abstract mediator processes as well as their concrete, running (Web) service counterpart. Using the jABC as a common frame helps highlighting the essential differences and similarities. It turns out, at least at the level of complication of the considered case study, all approaches behave quite similarly, both considering the performance as well as the modeling. We believe that turning the jABC framework into experimentation platform along the lines presented here, will help understanding the application profiles of the individual synthesis solutions and technologies, answering questing like when the overhead to achieve compositionality pays of and where (heuristic) search is the technology of choice.".
- 360 hasAuthorList authorList.
- 360 hasTopic Semantic_Web.
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- 360 title "Synthesizing Semantic Web Service Compositions with jMosel and Golog".
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- item-1 hasContent tiziana-margaria.
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- item-2 hasContent daniel-meyer.
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- item-5 hasContent bernhard-steffen.
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- 361 creator stefan-decker.
- 361 creator vit-novacek.
- 361 type InProceedings.
- 361 label "Towards Lightweight and Robust Large Scale Emergent Knowledge Processing".
- 361 sameAs 361.
- 361 abstract "We present a lightweight framework for processing uncertain emergent knowledge that comes from multiple resources with varying relevance. The framework is essentially RDF-compatible, but allows also for direct representation of contextual features (e.g., provenance). We support soft integration and robust querying of the represented content based on well-founded notions of aggregation, similarity and ranking. A proof-of-concept implementation is presented and evaluated within large scale knowledge-based search in life science articles.".
- 361 hasAuthorList authorList.
- 361 hasTopic Semantic_Web.
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- 361 title "Towards Lightweight and Robust Large Scale Emergent Knowledge Processing".
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- item-1 hasContent vit-novacek.
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- item-2 hasContent stefan-decker.
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- 370 creator luke-steller.
- 370 creator mohamed-gaber.
- 370 creator shonali-krishnaswamy.
- 370 type InProceedings.
- 370 label "A Weighted Approach for Partial Matching in Mobile Reasoning".
- 370 sameAs 370.
- 370 abstract "Due to significant improvements in the capabilities of small devices such as PDAs and smart phones, these devices can not only consume but also provide Web Services. The dynamic nature of mobile environment means that users need accurate and fast approaches for service discovery. In order achieve high accuracy semantic languages can be used in conjunction with logic reasoners. Since powerful broker nodes are not always available (due to lack of long range connectivity), create a bottleneck (since mobile devices are all trying to access the same server) and single point of failure (in the case that a central server fails), on-board mobile reasoning must be supported. However, reasoners are notoriously resource intensive and do not scale to small devices. Therefore, in this paper we provide an efficient mobile reasoner which relaxes the current strict and complete matching approaches to support anytime reasoning. Our approach matches the most important request conditions (deemed by the user) first and provides a degree of match and confidence result to the user. We provide a prototype implementation and performance evaluation of our work.".
- 370 hasAuthorList authorList.
- 370 hasTopic Semantic_Web.
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- 370 title "A Weighted Approach for Partial Matching in Mobile Reasoning".
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