ELIS – Multimedia Lab           RESTdesc   Efficient runtime service discovery and consumption.            Ruben Verborgh,...
ELIS – Multimedia Lab                Talking with others is difficult                    when you’re different.           ...
ELIS – Multimedia Lab                                                   The goal is not                                   ...
ELIS – Multimedia Lab  …but to stand out.                                             RESTdesc© Nicholas Kreidberg   Effic...
What makes a Web service stand out from others?   Functionality.
Capturing functionality is vital for automatedservice consumption.
ELIS – Multimedia Lab       RESTdesc  Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. W...
ELIS – Multimedia Lab       RESTdesc  Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. W...
ELIS – Multimedia LabExample service: calculating photo height                                                            ...
ELIS – Multimedia Lab Several service description methods exist.FACT: there are already lots of ways to describe that • th...
ELIS – Multimedia Lab       They don’t describe functionality.         53                                                 ...
ELIS – Multimedia LabFunctional descriptions tell the whole story.                                                        ...
ELIS – Multimedia Lab       RESTdesc  Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. W...
ELIS – Multimedia Lab           Ingredients of RESTdesc• HTTP  • resources                                      RESTdesc  ...
ELIS – Multimedia LabREST-style HTTP is resource-oriented.        http://example.com/images/wolfie        This is a resour...
ELIS – Multimedia Lab           Ingredients of RESTdesc• HTTP  • resources• Notation3 (N3)  • small superset of RDF       ...
ELIS – Multimedia Lab     Everything in RDF has 3 parts.               :MyPhoto  :a  :Photo.             subject verb obje...
ELIS – Multimedia Lab        RDF is organized in vocabularies.@prefix  :  <http://example.org/photo/>.  @prefix  rdf:  <ht...
ELIS – Multimedia Lab           Ingredients of RESTdesc• HTTP  • resources• Notation3 (N3)  • small superset of RDF• your ...
ELIS – Multimedia Lab How do we describe this functionality?                                                              ...
ELIS – Multimedia Lab         Photo height service in RESTdesc@prefix  :  <http://restdesc.no.de/ontlogies/photos#>.@prefi...
ELIS – Multimedia Lab         Photo height service in RESTdescIf your photohas identifier “wolfie”...{                    ...
ELIS – Multimedia Lab         Photo height service in RESTdesc... then ...{    ?photo  :photoId  ?id.}=>{      _:request  ...
ELIS – Multimedia Lab         Photo height service in RESTdesc...you can use HTTP to get/photos/wolfie/height...{    ?phot...
ELIS – Multimedia Lab         Photo height service in RESTdesc...and the response will                                    ...
ELIS – Multimedia Lab         Photo height service in RESTdesc...which is                                                 ...
ELIS – Multimedia LabThis description contains everything you need.                                                       ...
ELIS – Multimedia Lab       RESTdesc  Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. W...
ELIS – Multimedia LabRESTdesc descriptions are simple, because…They rely on HTTP and HTTP best practices. • resource-orien...
ELIS – Multimedia LabRESTdesc descriptions are powerful, because…They use the Resource Description Framework. • logically ...
RESTdesc enables     straightforwardautomated use of services.
Seeing services as resources      leads to elegant functional descriptions.
In functional descriptions, services are not defined by what they look like…
ELIS – Multimedia Lab  …but bywhat they do.                                  http://restdesc.org/                         ...
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RESTdesc – Efficient runtime service discovery and consumption

  1. 1. ELIS – Multimedia Lab RESTdesc Efficient runtime service discovery and consumption. Ruben Verborgh, Thomas Steiner,Davy Van Deursen, Rik Van de Walle, Joaquim Gabarró Vallés
  2. 2. ELIS – Multimedia Lab Talking with others is difficult when you’re different. RESTdesc© Jule Berlin Efficient runtime service discovery and consumption. 2
  3. 3. ELIS – Multimedia Lab The goal is not RESTdesc to blend in…© Eric Vest Efficient runtime service discovery and consumption. 3
  4. 4. ELIS – Multimedia Lab …but to stand out. RESTdesc© Nicholas Kreidberg Efficient runtime service discovery and consumption. 4
  5. 5. What makes a Web service stand out from others? Functionality.
  6. 6. Capturing functionality is vital for automatedservice consumption.
  7. 7. ELIS – Multimedia Lab RESTdesc Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. What? – syntax and structure3. So what? – benefits and potential RESTdesc Efficient runtime service discovery and consumption. 7
  8. 8. ELIS – Multimedia Lab RESTdesc Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. What? – syntax and structure3. So what? – benefits and potential RESTdesc Efficient runtime service discovery and consumption. 8
  9. 9. ELIS – Multimedia LabExample service: calculating photo height 768photo height servicesend a photo, retrieve its height in pixels RESTdesc Efficient runtime service discovery and consumption. 9
  10. 10. ELIS – Multimedia Lab Several service description methods exist.FACT: there are already lots of ways to describe that • the input is an image; • the output is a height in pixels.FACT: none of them really helps... wait? RESTdesc Efficient runtime service discovery and consumption. 10
  11. 11. ELIS – Multimedia Lab They don’t describe functionality. 53 768 23.489What height in pixels? • The height of the face rectangle in the image? • The optimal height on a certain mobile device? • The height of the costume, mysteriously converted to pixels? RESTdesc Efficient runtime service discovery and consumption. 11
  12. 12. ELIS – Multimedia LabFunctional descriptions tell the whole story. 768What height in pixels?Only the functional relation tells us this:send a photo, retrieve its height in pixels RESTdesc Efficient runtime service discovery and consumption. 12
  13. 13. ELIS – Multimedia Lab RESTdesc Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. What? – syntax and structure3. So what? – benefits and potential RESTdesc Efficient runtime service discovery and consumption. 13
  14. 14. ELIS – Multimedia Lab Ingredients of RESTdesc• HTTP • resources RESTdesc Efficient runtime service discovery and consumption. 14
  15. 15. ELIS – Multimedia LabREST-style HTTP is resource-oriented. http://example.com/images/wolfie This is a resource. http://example.com/images/wolfie/height This is a resource, too. They’re even the same resources 768 as those on the Semantic Web: “Resource Description Framework”. RESTdesc Efficient runtime service discovery and consumption. 15
  16. 16. ELIS – Multimedia Lab Ingredients of RESTdesc• HTTP • resources• Notation3 (N3) • small superset of RDF RESTdesc Efficient runtime service discovery and consumption. 16
  17. 17. ELIS – Multimedia Lab Everything in RDF has 3 parts.     :MyPhoto  :a  :Photo. subject verb object                                                       RESTdesc Efficient runtime service discovery and consumption. 17
  18. 18. ELIS – Multimedia Lab RDF is organized in vocabularies.@prefix  :  <http://example.org/photo/>.  @prefix  rdf:  <http://www.w3.org/1999/02/22-­‐rdf-­‐syntax-­‐ns#>.@prefix  dbpedia:  <http://dbpedia.org/resource/>. :MyPhoto  rdf:type  dbpedia:Photo.                                                       RESTdesc Efficient runtime service discovery and consumption. 18
  19. 19. ELIS – Multimedia Lab Ingredients of RESTdesc• HTTP • resources• Notation3 (N3) • small superset of RDF• your own vocabulary RESTdesc Efficient runtime service discovery and consumption. 19
  20. 20. ELIS – Multimedia Lab How do we describe this functionality? 768photo height servicesend a photo, retrieve its height in pixels RESTdesc Efficient runtime service discovery and consumption. 20
  21. 21. ELIS – Multimedia Lab Photo height service in RESTdesc@prefix  :  <http://restdesc.no.de/ontlogies/photos#>.@prefix  http:  <http://www.w3.org/2006/http#>.@prefix  tmpl:  <http://purl.org/restdesc/http-­‐template#>.{ Not a new model.    ?photo  :photoId  ?id. This is RDF in Notation3,} a Semantic Web language.=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 21
  22. 22. ELIS – Multimedia Lab Photo height service in RESTdescIf your photohas identifier “wolfie”...{ “wolfie ”    ?photo  :photoId  ?id.}=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 22
  23. 23. ELIS – Multimedia Lab Photo height service in RESTdesc... then ...{    ?photo  :photoId  ?id.}=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 23
  24. 24. ELIS – Multimedia Lab Photo height service in RESTdesc...you can use HTTP to get/photos/wolfie/height...{    ?photo  :photoId  ?id.}=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 24
  25. 25. ELIS – Multimedia Lab Photo height service in RESTdesc...and the response will 768represent a value...{    ?photo  :photoId  ?id.}=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 25
  26. 26. ELIS – Multimedia Lab Photo height service in RESTdesc...which is 768that photo’s height.{ “wolfie ”    ?photo  :photoId  ?id.}=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 26
  27. 27. ELIS – Multimedia LabThis description contains everything you need. 768 “wolfie” “wolfie ”{    ?photo  :photoId  ?id. It’s that simple.} And it’s that powerful.=>{      _:request  http:methodName  "GET";                          tmpl:requestURI  ("/photos/"  ?id  "/height");                          http:resp  [  tmpl:represents  ?pixels  ].      ?photo  :height  ?pixels.}. RESTdesc Efficient runtime service discovery and consumption. 27
  28. 28. ELIS – Multimedia Lab RESTdesc Efficient runtime servicediscovery and consumption.1. Why? – need and challenges2. What? – syntax and structure3. So what? – benefits and potential RESTdesc Efficient runtime service discovery and consumption. 28
  29. 29. ELIS – Multimedia LabRESTdesc descriptions are simple, because…They rely on HTTP and HTTP best practices. • resource-orientedThey use the vocabulary you choose. • descriptions adapts to your domainThey describe only what you need. • concepts live in vocabularies • “height” is an integer, expresses a length in pixels RESTdesc Efficient runtime service discovery and consumption. 29
  30. 30. ELIS – Multimedia LabRESTdesc descriptions are powerful, because…They use the Resource Description Framework. • logically sound • allows complex expressions • interoperable with other services and dataThey can be composed by generic reasoners. • all N3 reasoners understand RESTdesc • enables goal-driven service composition RESTdesc Efficient runtime service discovery and consumption. 30
  31. 31. RESTdesc enables straightforwardautomated use of services.
  32. 32. Seeing services as resources leads to elegant functional descriptions.
  33. 33. In functional descriptions, services are not defined by what they look like…
  34. 34. ELIS – Multimedia Lab …but bywhat they do. http://restdesc.org/ RESTdesc Efficient runtime service discovery and consumption. 34
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