A Semantic Description Language for RESTful Data Services to Combat Semaphobia

1. A Semantic Description Language for RESTful Web Services to Combat Semaphobia Markus Lanthaler Graz University of Technology

2. Web services are increasingly popular

3. Why do we Why do we need a website? need an API? 1995 2000 2005 2010 Of course we Of course we have a website have an API Adapted from T. Vitvar’s and J. Musser’s ECOWS 2010 Keynote, “ProgrammableWeb.com: Statistics, Trends, and Best Practices”

4. Lightweight semantic annotations start to gain acceptance

5. Increasing interest in the relationship of RESTful services and Linked Data

6. Need a machine-readable service description © Clever Cupcakes

7. © Nesster All previous efforts assume RPC-style. REST is different.

8. Semaphobia!?

9. simplicity son

10. Metadata Element description Model Prefixes Links Type ref. Semantics Properties Items Media type & Prefix Name URI Target SEREDASj desc. Predicate Object(s) Name Request Semantics SEREDASj d. Variables Semantics Model Predicate Object(s) Name Binding Predicate Object(s) ref.

11. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] }

12. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] } { "meta": { "prefixes": { "foaf": "http://xmlns.com/foaf/0.1/", "ex": "http://example.com/onto#", ... }, },

13. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] } "type": "object", "model": "[foaf:Person]", "properties": { "id": { "type": "number", "model": "[ex:id]" }, "first_name": { "type": "string", "model": "[foaf:firstName]" }, "last_name": { "type": "string", "model": "[foaf:surname]" }, ...

17. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] } "links": { "/user/search{?query}": { "mediaType": "application/json", "seredasjDescription": "personlist.json", "semantics": { "[iana:relation]": "[iana:search]" }, "variables": { "query": { "model": "[foaf:name]" } } },

18. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] } "/user/{id}": { "mediaType": "application/json", "seredasjDescription": "#", "variables": { "id": { "binding": "#properties/knows/id" } }, "requestDescription": "#" } }

19. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] }

20. A person. (object) id number first_name string The first name of a person. last_name string The surname of some person. gender string The gender of this Agent (typically but not necessarily 'male' or 'female'). knows array A person known by this person (indicating some level of reciprocated interaction between the parties). A person. (object) id number name string A name for some thing.

21. strong emphasis on simplicity many use cases son discovery and composition

23. Questions? Markus Lanthaler Markus.Lanthaler@student.TUGraz.at

24. Image Credits (3) Adapted from T. Vitvar’s and J. Musser’s ECOWS 2010 Keynote, “ProgrammableWeb.com: Statistics, Trends, and Best Practices” (7) http://en.wikipedia.org/wiki/The_Scream (9) http://www.flickr.com/photos/clevercupcakes/4397152402/ (10) http://www.flickr.com/photos/nesster/3168425434/

25. Bonus Slides

26. { "id": 556410, "first_name": "Markus", "last_name": "Lanthaler", "gender": "male", "knows": [ { "id": 586807, "name": "Christian Gütl" }, { "id": 790980, "name": "John Doe" } ] } "knows": { "type": "array", "model": "[foaf:knows]", "items": { "type": "object", "model": "[foaf:Person]", "properties": { "id": { "type": "number", "model": "[ex:id]" }, ...

29. @base <http://example.com/user/556410> . <#> rdf:type foaf:Person . <#> ex:id 556410 . <#> foaf:firstName "Markus" . <#> foaf:surname "Lanthaler" . <#> foaf:gender "male" . <#> foaf:knows <#knows/0> . <#knows/0> rdf:type foaf:Person . <#knows/0> ex:id 586807 . <#knows/0> foaf:name "Christian Gütl" . <#> foaf:knows <#knows/1> . <#knows/1> rdf:type foaf:Person . <#knows/1> ex:id 790980 . <#knows/1> foaf:name "John Doe" . <http://example.com/user/586807> owl:sameAs <#knows/0> . <http://example.com/user/790980> owl:sameAs <#knows/1> .

A Semantic Description Language for RESTful Data Services to Combat Semaphobia

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