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Semantics on services: the story so far (SALAD2015 keynote at ESWC2015)

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My keynote for the SALAD2015 wokshop at ESWC2015)

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Semantics on services: the story so far (SALAD2015 keynote at ESWC2015)

  1. 1. the story so far Services and Applications over Linked APIs and Data workshop at the 12th Extended Semantic Web Conference Portorož, June 1, 2015 semantics on services
  2. 2. Who Am I? Partner Technology Manager at Redlink GmbH also… External Lecturer at Fachhochschule Salzburg Member of the Apache Software Foundation previously… Senior Researcher at Salzburg Research Research Engineer at Fundacion CTIC Sergio Fernández @wikier http://linkedin.com/in/sergiofernandez http://www.wikier.org
  3. 3. - 10+ years experience in software engineering; - participated in 20+ international research projects; - successfully deployed 50+ industrial solutions; - co-founded 3 Apache projects. the team Redlink GmbH is a Austrian startup, headquartered in Salzburg, that provides cloud services for Content Analysis, Linked Data Publishing and Semantic Search. @RedlinkGmbH http://linkedin.com/company/redlink-gmbh http://redlink.co Who Are We?
  4. 4. Redlink offers named-entity recognition and linking, topic classification, fact extraction and topic classification from textual and media documents in different languages. Text Analysis & Entity Linking Linked Data Publishing Application development Enterprise Data Linking Redlink offers services to build your own applications by combining existing analysis tools and datasets. Redlink offers cleaning, transformation and reconciliation of legacy enterprise data using open standards and technologies. Redlink offers data management and data publication using open standards Linked Data technologies. connect your content with data that matters
  5. 5. semantics on services what have we achieved?
  6. 6. Service-Oriented Architectures ● Always aimed to enable the development of applications by combining loosely coupled and interoperable services. ● Many technical proposals have came to address the new problems that a connected world requires. ● But beyond the syntax, the semantics has been always the main issue for services' interoperability.
  7. 7. Services _before_ Semantic Web Semantics is a much bigger field than what Semantic Web actually touches... Them, of course, common SOA technologies already have some sense of semantics: ● SOAP ○ WSDL ● etc... ● RPC ○ only on failures ● CORBA ○ IDL
  8. 8. then back in 1989 Tim Berners-Lee proposed the concept of Semantic Web... and since that everything is "semantically-enriched"
  9. 9. Semantic Web Services
  10. 10. Semantics Web Services proposals ● WSMO Stack ○ WSMO ○ WSML ○ WSMX ○ ... ● WSDL-S ● OWL-S ● SAWSDL ● etc..
  11. 11. REpresentational State Transfer ● REST revolutionized the Web providing an effective mechanism to implement simple Web APIs ● Simple data formats ○ XML at the beginning ○ JSON has overtook ● No formal protocol, no "official" standard, just a set of conventions over HTTP ○ Therefore no formal semantics beyond the basic operations / verbs ○ Simplicity is the key
  12. 12. where is my contract?
  13. 13. Read-Write Linked Data 2007 Linked Data Design Issues http://www.w3.org/DesignIssues/LinkedData.html 2009 Read-Write Linked Data http://www.w3.org/DesignIssues/ReadWriteLinkedData.html 2010 Linked Media Principles http://bitbucket.org/srfgkmt/lmf/wiki/Principles-Linked-Media 2010 SPARQL 1.1 Graph Store HTTP Protocol http://www.w3.org/TR/sparql11-http-rdf-update/ 2011 Linked Data Basic Profile 1.0 http://www.w3.org/Submission/ldbp/ 2012 Linked Data Platform 1.0 http://www.w3.org/2012/ldp/
  14. 14. a set of best practices and simple approach for a read-write Linked Data architecture, based on HTTP access to web resources that describe their state using the RDF data model Linked Data Platform Linked Data Platform 1.0 http://www.w3.org/TR/ldp/ W3C Recommendation 26 February 2015
  15. 15. L D P https://www.flickr.com/photos/rachelpasch/3432013868
  16. 16. https://www.flickr.com/photos/sybrenstuvel/2468506922
  17. 17. HATEOAS ● Hypermedia as the Engine of Application State is a constraint of REST ● Hydra aims to simplify the development of interoperable Web APIs using hypermedia controls ○ JSON-LD as pillar ● Some overlap (better resolved?) with LDP ○ containers and pagination ● Some good early results ○ e.g., Linked Data Fragments ● Still a lot of work to do in the W3C CG...
  18. 18. Glory of REST
  19. 19. What lies ahead...? ● Monolithic services do not scale ● Microservice architectures commonly provide a better solution for Web-scale problems ○ Services solving small concrete problems ○ Loosely couple ○ Low semantics on description ○ Stronger on business ● Open your mind ○ RDF is not the single data format ○ HTTP is not the single protocol ● Make easy for developers to jump in ● Test, learn, combine and test again
  20. 20. vision https://www.flickr.
  21. 21. test yourself! scientific evaluation is not the way to validate a solution against real world problems
  22. 22. questions / discussion
  23. 23. hvala! https://www.flickr.com/photos/hanspoldoja/1218526964/

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