Planetdata simpda


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Planetdata simpda

  1. 1. PlanetData: Consuming Structured Data at Web Scale Elena Simperl, Barry Norton, Karlsruhe Institute of Technology1st International Symposium on Data-driven Process Discovery and Analysis June 30, 2011, Campione d’Italia, Italy
  2. 2. PlanetData‘s Aim and Objectives Aim: establish an interdisciplinary, sustainable European community on large-scale data management ◦ Purposeful data exposure Databases ◦ Novel and improved applications Data and Semantics Web Mining• Objectives ◦ Addressing challenges through integrated research ◦ Data and technology provisioning through PlanetData Lab ◦ Impact through training, dissemination, standardization and networking ◦ Openness and flexibility through PlanetData Programs
  3. 3. Work Plan Highlights Methods and techniques to publish, access and manage stream- like data Quality assessment of interlinked data sets, including best practices for the representation and usage of spatio-temporal information Provenance and access control framework for Linked (Stream) Data Data sets and vocabularies, including best practices for publishing and managing self-descriptive data Linked Services and Processes as an instrument to develop applications Yearly summer school co-located with the Extended Semantic Web Conference Semantic Web video journal PlanetData Programs
  4. 4. The Rise of Linked Data 8/10/2011 Slide 4 of x
  5. 5. & public sector information Many data sets useful for business intelligence
  6. 6. BBC & Media Value of content increased by Linked Data
  7. 7. BestBuy & eCommerce Structured mark-up increases visibility
  8. 8. Linked Data Cloud Taken together Linked Data is said to form a ‘cloud’ of shared references and vocabularies (growing on a weekly basis)
  9. 9. Linked Data Principles 1. Use URIs as names for things 2. Use HTTP URIs so that people can look up those names. 3. When someone looks up a URI, provide useful information, using the standards (RDF, SPARQL) 4. Include links to other URIs, so that they can discover more things. Bring together semantic technologies and the Web architecture Applied to other types of data as well: stream- like, multimedia…
  10. 10. Consuming Linked Data 8/10/2011 Slide 10 of x
  11. 11. Services Over Linked Data A problem can be seen in the current Linked Data sphere when it comes to services/APIs/functionalities The standards are often not then used The results of service interaction do not contribute to the Linked Data cloud Developers have to work with heterogeneous representations RDF
  12. 12. RDF Services at the BBC This is not a problem of scale, efficiency or speed RDF-based communication efficiently realised using memcached 04.08.201 Real-time updates to a large 0 (ferocious) audience
  13. 13. Linked Open Services Aim to promote services over Linked Data bringing together: RESTful services (respecting Web architecture) ◦ Resource-oriented ◦ Manipulated with HTTP verbs  GET, PUT (, PATCH), POST, DELETE ◦ Negotiate representations Linked Data ◦ Uniform use of URIs ◦ Use of RDF and SPARQL
  14. 14. Linked Services: Principles Concretely, Linked Open Services come with a set of guiding principles: 1. Describe services as LOD prosumers with input and output descriptions as SPARQL graph patterns 2. Communicate RDF by RESTful content negotiation 3. Communicate and describe the knowledge contribution resulting from service interaction, including implicit knowledge relating input, output and service provider Associated with the last principle is an optional fourth: 4. When wrapping non-LOS services, extend the (lifted, if non-RDF) message to make explicit the implicit knowledge, and to use Linked Data vocabularies, using SPARQL CONSTRUCT queries
  15. 15. LOS Weather Service Input: [a wgs84:Point; wgs84:lat ?lat; wgs84:long ?long] Output:[met:weatherObservation [ weather:hasStationID ?icao geonames:inCountry ?country; ... weather:hasWindEvent [weather:windDirection ?windDirection], [weather:windSpeed ?windSpeed]
  16. 16. Linked Processes: Principles In order to compose Linked Services we are not specific about the style, except that RDF must be stored and forwarded Principles: ◦ Decide control flow conditions based on SPARQL ASK queries ◦ Base iteration on SPARQL SELECT queries ◦ Define dataflow/mediation based on SPARQL CONSTRUCT queries In this way compositions, ‘mash-up’s, etc., also use the languages/technologies most familiar to the Linked Data community
  17. 17. LOP Media Monitoring Process A Social Media Manager is required to monitor (micro)blogging sites and respond to negative comments: 10.08.2011
  18. 18. Composition Service 1 A service may monitor the ‘Twittersphere’ for tweets with a given tagHarvestInput: {?t a sioc_t:Tag; rdfs:label ?l}Output: {?p a sioc_t:MicroblogPost; sioc:topic ?t; sioc:has_creator ?m; sioc:content ?c . OPTIONAL {?p sioc:addressed_to ?a}} 10.08.2011
  19. 19. Composition Service 2 A sentiment analysis service may annotate (micro)blog posts according to, e.g., the Human Emotion OntologyAnalyseSentimentInput: {?p a sioc:Post; sioc:content ?c}Output: {?e a heo:Emotion; heo:hasManifestationInMedia ?p; heo:hasCategory ?c} 10.08.2011
  20. 20. Composition Service 3 A human service selects among possible combinations of these and optionally raises a responseManageMicroblogInput: {?p a sioc_t:MicroblogPost; sioc:has_creator ?m. ?e heo:hasManifestationInMedia ?p. {?e heo:hasCategory heo:anger UNION ?e heo:hasCategory heo:disgust}}Output: {OPTIONAL {?r a sioc_t:MicroblogPost; sioc:addressed_to ?m}} 10.08.2011
  21. 21. PlanetData Collaborations 8/10/2011 Slide 22 of x
  22. 22. http://www.planet-data.euJoin PlanetData Associate partners have  Access to open training infrastructure  Early access to ongoing PD results through participation in PlanetData meetings  Opportunity to shape the results and topics of the PD Programs through contribution of requirements and use cases PlanetData Programs call in 2012
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