1.
AligningWeb Serviceswith theSemantic Webto Create aGlobal Read-WriteGraph of DataMarkus LanthalerGraz University of Technology

2.
Web services are increasingly popular

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Twitter Facebook Google15 billion 5 billion 5 billion per day per day per day

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Semantic Web is still in its infancy

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Semaphobia!?

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Lightweight semantic annotations start to gain acceptance

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Increasing interest in the relationship of RESTful services and Linked Data

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Increasing interest in the relationship of RESTful services and Linked Data

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

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simplicity son

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

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{ "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]" }, ...

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{ "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]" }, ...

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{ "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]" }, ...

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{ "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": "#" } }

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{ "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]" } } },

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

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Two Algorithms

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1 select ← createSelect(query) 2 bindings ← tripleStore.execute(select) 3 4 for each binding in bindings do 5 deleteData ← createDeleteData(query, binding) 6 operations.add(deleteData) 7 insertData ← insertDeleteData(query, binding) 8 operations.add(insertData) 9 end for1011 operations.sort()12 translateDataOperations(operations)

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1 do 2 requests ← retrievePotentialRequests(triples) 3 progress ← false 4 while requests.hasNext() = true do 5 request ← requests.next() 6 request.setData(triples) 7 request.setData(tripleStore) 8 if isValid(request) = true then 9 if request.submit() = success then10 resp ← request.parseResponse()11 triples.update(resp.getTriples())12 tripleStore.update(resp.getTriples())13 requests.remove(request)14 progress ← true15 end if16 end if17 end while18 while progress = true19 if triples.empty() = true then20 success()21 else22 error(triples)23 end if

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Publication Management Service

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/author/{id} /publication/{id} foaf:Person foaf:Documentid ex:persId id ex:pubIdname foaf:givenName X title dc:title Xlastname foaf:familyName X authors[] dc:creator Xaddress v:adr id ex:persId X city v:locality name foaf:name country v:country-name

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1 INSERT DATA { 2 _:public1 a foaf:Document ; 3 dc:title "My first paper" ; 4 dc:creator _:author1 ; 5 dc:creator auth:cg789 . 6 _:author1 a foaf:Person ; 7 foaf:givenName "Markus" ; 8 foaf:familyName "Lanthaler" ; 9 v:adr _:addr1 .10 _:addr1 v:country-name "Italy" .11 }POST /publication/ POST /author/ { "title": "My first paper", "authors": [ { "id": "cg789" } ] }201 CreatedLocation: /publication/p489/

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1 INSERT DATA { 2 _:public1 a foaf:Document ; 3 pub:p489 dc:title "My first paper" ; 4 dc:creator _:author1 ; 5 dc:creator auth:cg789 . 6 _:author1 a foaf:Person ; 7 auth:ml98 foaf:givenName "Markus" ; 8 foaf:familyName "Lanthaler" ; 9 v:adr _:addr1 .10 _:addr1 v:country-name "Italy" .11 }POST /publication/ POST /author/ { "title": "My first paper", { "name": "Markus", "authors": [ "lastname": "Lanthaler", { "id": "cg789" } "address": { ] "country": "Italy" } } }201 Created 201 CreatedLocation: /publication/p489/ Location: /author/ml98

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1 INSERT DATA { 2 _:public1 a foaf:Document ; 3 pub:p489 dc:title "My first paper" ; 4 dc:creator auth:ml98 ; 5 dc:creator auth:cg789 . 6 _:author1 a foaf:Person ; 7 auth:ml98 foaf:givenName "Markus" ; 8 foaf:familyName "Lanthaler" ; 9 v:adr _:addr1 .10 _:addr1 v:country-name "Italy" .11 }PUT /publication/p489 { "title": "My first paper", "authors": [ { "id": "cg789" }, { "id“: "ml98" } ] }200 OK

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do it on-the-fly

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Thank You© 2011, Markus Lanthaler. Some Rights Reserved.http://creativecommons.org/licenses/by-nc-sa/3.0/

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Questions?Markus Lanthaler @MarkusLanthalerMarkus.Lanthaler@student.TUGraz.at http://www.slideshare.net/lanthaler

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Image Credits(1) http://galleries.www.frut.lv/en/5432/959(3) Adapted from “Two Billion is Cool,” M. Thomson. Available: http://corp.klout.com/blog/2011/07/two-billion-is-cool/(5) http://en.wikipedia.org/wiki/The_Scream(9) http://www.flickr.com/photos/nesster/3168425434/