RESTFul Services, Does it Matter Anymore?
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This document discusses the evolution of web services and the need for web applications to support activities and actions within a social semantic web. It advocates for defining activities as relationships between users, verbs, and objects. It also recommends using common vocabularies and ontologies to publish and discover potential activities. Finally, it provides examples of representing activities using RDF and the Open Graph protocol to link data and enable activities to be shared and propagated social networks.
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RESTFul Services, Does it Matter Anymore?
- 1. OpenGraph http://www.esipfed.org/ RESTFul Services, Does It Really Matter Anymore? Pat Cappelaere ESIP Information Technology & Interoperability Rant & Rave... Building Tomorrow’s Social Web Apps Oct 4th, 2012 1
- 2. Web Services Evolution • 1990 REST/RPC • 2005-2010 SOA (SOAP WS-* Stack) • 2010- ROA (REST + HyperMedia) • Is Richardson Maturity Level 3 The Final Goal? 2
- 3. Richardson Maturity Level 3 • Resources & HTTP Verbs (GET/POST/PUT/DELETE) • Stateless • Caching • Code on Demand • Hypermedia Controls (Hypertext As The Engine Of Application State HATEOAS) • Discoverability & Self-Documentation We Are Still Getting It Wrong! 3
- 4. Facebook Anybody? 4
- 5. What’s Happening? • Welcome To The Social Web • Users Like To Share Their Actions On The Web • Other Users Are Actually Interested In Those Activities • They May Actually Start Changing Their Behaviours Based On What Their Friends Are Doing 5
- 6. The Other Thing Tomorrow’s Primary Users of Your Web Site Will Not Be Humans Forget about a web page interface... User-agents will be primary users of your app... 6
- 7. How Could This Apply To Us? view task process model 7
- 8. Or This? CATHALAC Disaster Management Belize Group member Stu know Story Emil Comments know task GSFC Development Science MSO Pat Applications download Petya Antonio Hypercube process create create WCPS WCPS Algorithm Unmixing Algorithm spatial indexing Products 8
- 9. How Can We Define User Activities? • {User} {Verb} {Object} [{Target}] 9
- 10. Activity Streams = Activity Output Protocol Already Exists http://activitystrea.ms/ 10
- 11. How Can We Publish/Discover Activity Potential? We Are Talking About Activities That Have Not Happened Yet We Are Talking About Web Applications That Provide Capabilities That Result In Activities 11
- 12. Issues • Define Object Types • Define Actions or Verbs Types • Action Verbs & Action Links (linking Actions / Activities) What About Constraints? Welcome To The Social Semantic Web! 12
- 13. OGC Activities Examples {user | system} {acquired} {observation} {user} {searches for} {observations | products | maps | features | …} {user} {is viewing} {an observation | map | product | …} {user} {likes} {observation} {user} {processed} {observation} {user} {executed} {algorithm} {observation} {user} {downloaded} {observations | products | map layer} {user} {ordered} {imagery product} {user} {requested feasibility) {location} {user} {requested imaging) {location} {user} {collaborates with} {user} 13
- 14. Linked Data and Semantic Web • Facebook Open Graph Protocol • Google Social Graph (Google+) • dc, schema.org, UMBEL, FOAF, Cyc... We Need Our Own Open Graph API To Link Our Data, Verbs, Action Links... We Need A Shared Ontology (or Common Vocabulary) 14
- 15. Next Problem: Representation • RDF • HTML5 + RDFa • JSON+LD • JSON-Schema, Siren... • RDFa or RDFa-lite • Microformats, Microdata • RIF (Rule Interchange Format)... 15
- 16. Getting to REST Level 4 Level 4: Activities http://martinfowler.com/articles/richardsonMaturityModel.html 16
- 17. Object Target User Story • User downloads Radarsat2 Floodmap of Haiti (and recommends it) • or may be processed it and published it verbs • Activity appears in Timeline • Many Other friends see it (Facebook Page) and start doing it as well • -> and it goes viral from there... Activity appears in Activity appears in Scientist “publishes” News Feed of Many Timeline Friends Many friend scientists see the post and start collaborating Social Science? 17
- 18. 18
- 19. Meta Tag Sample: Floodmap <head prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb# radarsat: http://ogp.me/ns/fb/radarsat#"> <meta property="fb:app_id" content="174581479345038" /> <meta property="og:type" content="radarsat:floodmap" /> <meta property="og:url" content="Put your own URL to the object here" /> <meta property="og:title" content="Sample Floodmap" /> <meta property="og:image" content="https://fbcdn.net/images/devsite/img.png" /> 19
- 20. Take Away Linked Data in Web Apps For Tomorrow’s Users (Not Human) Using Activity and Action Links Within a Semantic Web and Social Networks Thank You Pat Cappelaere pat@cappelaere.com http://www.vightel.com 20
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