Kai Schlegel, M.Sc. (kai.schlegel@googlemail.com)

LOD weather forecasting: Cloudy with a chance of services

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Linked Data is the heart of Semantic Web “

- W3C Semantic Web Group

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A Little Semantic Goes a Long Way “ - Prof. James A. Hendler

Challenges (among others):

•  Find URI for entity

•  Distributed datasets

•  Inhomogenous Data

•  Contradicting Facts

•  Querying Endpoints

•  Finding relevant or similar information

Cumbersome data

consumption

Linked Open Data 5

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Plethora of Tools Available

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Tools Public Available?

•  „Paper only“

•  Download •  complex setup/usage •  maintenance •  fixed (research) purpose •  documentation •  cost-effectiveness considerations

Nothing-as-a-Service

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API FTW!

Make a complex task easier to use and offer convenient methods for common tasks

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Cloudify Linked Open Data

Integration

Shared Infrastructure

Pay-as-you-go

Productivity

Flexibility

Cost of Ownership

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Public services and tools to consume Linked Data with less effort

no setup required

Overflight Fusion Synopsis Commonalities

Index Query Analyze View

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balloon Overflight

•  SPARQL based crawling of LOD endpoints

•  Simplified global view on structural interlinking •  Equivalence (sameAs)

•  Instances (type)

•  Inheritance (subClassOf)

•  ~255M triples •  Graph database for further analysis

•  Available for download

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balloon Fusion

•  SPARQL rewriting based on unified co-reference information

•  Exploit co-reference information for •  accomplishing immediate SPARQL rewriting

•  performing endpoint selection (provenance & namespace)

•  execute automatic query federation with adapted entities

•  Single point of access

Main principle: Semantic concept over identifier!

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balloon Commonalities

•  Shared characteristics of entities and types

•  Exploit extracted hierachy (trust influenced)

•  Associate Rule Mining •  Finding relevant super types of entities

•  Finding instances for given type

•  Finding related entities

•  Finding common predicates

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balloon Synopsis

•  Node-centric JavaScript visualization •  Easily embed RDF snippets in your website

•  Automatic information enhancement

•  Configurable Templating

Summary:

I believe … •  Linked Open Data would benefit from more services •  balloon crawled dataset holds great potential

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Cloudy with a chance of services

Any questions?

“

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The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!', but 'That's funny...' - Isaac Asimov