a dataflow platform for in-silico experiments based on...

A Dataflow Platform for In-silico ExperimentsBased on Linked Data

Paolo Bottoni Miguel Ceriani

Computer Science Department"Sapienza", University of Rome - Italy

Databases in Networked Information SystemsDNIS 2014

Bottoni, Ceriani (Univ. of Rome) Dataflow Platf. for Exp.s on Linked Data DNIS 2014 1 / 38

Motivation

Outline

1 Motivation

2 Background: Linked Data

3 Our Solution: SWOWSMain IdeasDataflow LanguageSemanticsPlatformExample Application

4 Conclusions


Motivation

Researching Online Databases


Motivation

Data Analysis and Visualizations


Motivation

Linked (Open) Data can help


Motivation

How to build an Open Data application?


Motivation

High Level, Expressive Design


Background: Linked Data

Outline

1 Motivation



4 Conclusions



Linked Open Data



RDF (1): the model



RDF (2): IRIs



SPARQL (1)

PREFIX foaf: <http://xmlns.com/foaf/0.1/>

SELECT ?name ?mbox

WHERE

{ ?x foaf:name ?name .

?x foaf:mbox ?mbox }



SPARQL (2): CONSTRUCT


PREFIX org: <http://example.com/ns#>

CONSTRUCT { ?x foaf:name ?name }

WHERE { ?x org:employeeName ?name }



SPARQL (3): UPDATE


WITH <http://example/addresses>

DELETE { ?person foaf:givenName ’Bill’ }

INSERT { ?person foaf:givenName ’William’ }

WHERE

{ ?person foaf:givenName ’Bill’

}


Our Solution: SWOWS

Outline

1 Motivation



4 Conclusions


Our Solution: SWOWS Main Ideas

Outline

1 Motivation



4 Conclusions



Open Computing

Transparent Boxes vs Black Boxes



Linked Programs



Dataflow Paradigm

Side-Effects Free Operators



Based on Established Standards

Web StandardsXML, XML DOM, XML DOM EventsScalable Vector Graphics

Semantic Web StandardsRDFSPARQL 1.1


Our Solution: SWOWS Dataflow Language

Outline

1 Motivation



4 Conclusions



Construct Graph Operator



Updatable Graph Operator


Our Solution: SWOWS Semantics

Outline

1 Motivation



4 Conclusions



Events and (Implicit) Time

Temporal RDF Graphs (snapshots)RDF Streams (descr. of events)



Fixpoint Operator



Update Semantics


Our Solution: SWOWS Platform

Outline

1 Motivation



4 Conclusions


Our Solution: SWOWS Platform

Platform Overview


Our Solution: SWOWS Example Application

Outline

1 Motivation



4 Conclusions



An example

Data usedFAO geopolitical ontologyWorld Map with country borders from Wikipedia

OutputCountries colored on the map by derived geopolitical indexes

InteractionRadio buttons, to choose one of three different geopolitical indexes



A screenshot



The dataflow


Conclusions

Outline

1 Motivation



4 Conclusions


Conclusions

Results

Model for Linked Data Interactive Appspipeline languagehandling of eventsRDF representation of UI

Web-based Dev Platform based on this Modelvisual pipeline editorthin-client pipeline engineRDF representation of pipelines


Conclusions

Future Work

Higher Level Development EnvironmentsUser Interface AdaptationMulti-Device InteractionParallel/Pipeline Processing


Conclusions

Acknowledgements

Sapienza, University of RomeDipartimento di Informatica (Computer Science Department)

Regione Lazio


Conclusions

Thank you!

swows.org

[email protected]


swows.org

[email protected]

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