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LDOW2012	                                                     Lyon,	  16	  April	  Linked Data Access 
Goes Mobile"Context...
Key Features"Background!WAC, [Abel et al, ISWC2007], [Finin et al.,SACMAT2008],[Flouris et al., FIS2010],[Sacco and Passan...
How it Works – Initial Setup"●  Named Graph Partitioning!   !●  Access Policy Definition!  !S4AC & PRISSMA Vocabularies!   ...
Sample Access Policy"                        Protected resource                            Conditions                     ...
How it Works"1.  Query Contextualization ! !!    INSERT DATA { !          SELECT … !   U                     +	      GRAPH...
How it Works"2.  Access Policy Evaluation!  ASK {?context !            a prissma:Context; !            prissma:environment...
How it Works"3.  Query Execution on Accessible Named  Graphs!                           :ng1 !         :ng2 !            S...
Response Time Evaluation"            RDF	  store	  and	  SPARQL	  1.1.	  engine:	  Corese-­‐KGRAM	  with	  Berlin	  SPARQL...
Future Work"                                            Privacy"                         	                          	     ...
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Linked Data Access Goes Mobile: Context Aware Authorization for Graph Stores

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Linked Data Access Goes Mobile: Context Aware Authorization for Graph Stores

  1. 1. LDOW2012   Lyon,  16  April  Linked Data Access 
Goes Mobile"Context-Aware Authorization for Graph Stores! SELECT … ! WHERE {…}!Luca  Costabello,  Serena  Villata    Nicolas  Delaforge,  Fabien  Gandon  
  2. 2. Key Features"Background!WAC, [Abel et al, ISWC2007], [Finin et al.,SACMAT2008],[Flouris et al., FIS2010],[Sacco and Passant, LDOW2011], [Toninelli et al, ISWC2006]! Semantic Web Pluggable to languages only" any RDF store! > No new Policy languages! > SPARQL 1.1! Granularity from Mobile context in triples to whole graphs! the loop! > Named Graphs! > Context Awareness! [Carroll  et  al,  WWW2005]   [Schilit  and  Theimer,  94]     RDF  1.1   [Dey,  01]   2  
  3. 3. How it Works – Initial Setup"●  Named Graph Partitioning! !●  Access Policy Definition! !S4AC & PRISSMA Vocabularies! 3  
  4. 4. Sample Access Policy" Protected resource Conditions to verify 4  
  5. 5. How it Works"1.  Query Contextualization ! !! INSERT DATA { ! SELECT … ! U +   GRAPH :ctx1{! WHERE {…}! P [! ! ! U P ,! ]! ,! , …! :ctx1! }}! 5  
  6. 6. How it Works"2.  Access Policy Evaluation! ASK {?context ! a prissma:Context; ! prissma:environment ?env.! ?env prissma:currentPOI ?poi. ! ?poi prissma:radius "500";! foaf:based_near ?p. ! =   "false"   ?p geo:lat "43.615811";! geo:long "7.068532".} ! BINDINGS ?context {(:ctx1)}! U P 6  
  7. 7. How it Works"3.  Query Execution on Accessible Named Graphs! :ng1 ! :ng2 ! SELECT … ! :ng3 ! WHERE {…}! SELECT …! FROM :ng2,:ng3! FROM NAMED :ng2,:ng3! WHERE {…}! 7  
  8. 8. Response Time Evaluation" RDF  store  and  SPARQL  1.1.  engine:  Corese-­‐KGRAM  with  Berlin  SPARQL  Benchmark  Dataset  3.1  • Dataset size still predominant! • More context updates, ! more consumers" à Slower!• Small fraction granted" à Faster!
  9. 9. Future Work" Privacy"                         Context data User-centered trustworthiness" evaluation"Luca  Costabello  |  Serena  Villata    |  Nicolas  Delaforge  |  Fabien  Gandon  @lukostaz " " @serena_villata @ndelaforge" " @fabien_gandon"tinyurl.com/shi3ld

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