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Querying the Web of DataKennissystemen, December 2010Rinke Hoekstra
OverviewLinked (Open) DataThe Web of DataScalability issuesTechnologyRDF SyntaxesRDF Storage and QueryingKennissystemen 2010
The Semantic Web IdeologyIdentity is everythingPartial solutions are great too!Layer cakeOWLKennissystemen 2010
The Web of Data… does it exist?Kennissystemen 2010
Linked DataKennissystemen 2010
Semantic WebIntially
`Metadata’ for web pages
Since ~2006
`Web of Data’
Semantic web as data source in its own right
Linked Data
A ‘Databaseesque’ Web
RDF Triple stores
Query languagesKennissystemen 2010
Storage (on the web)As documents.rdf, .n3, .turtle, .htmlRDF triple storesSesame, Joseki, 4Store, AllegroGraph, OpenLink Virtuoso, SDB/TDB, Open Calais, SWI Prolog Reasoners ‘on top’, or via DIGPellet, OWLIM, etc.SPARQL EndpointsResults as JSON, XML, CSV etc.Kennissystemen 2010
Data and the WebNeed to add this ‘meta’ to my ‘data’‘Linking’ data across sitesWeb of Documents and the Web of DataOld fashioned HTML:<link rel='meta' type='application/rdf+xml' href='http://www.leibnizcenter.org/~hoekstra/foaf.rdf' title='FOAF'> URL-basedHTTP 303 `see other’http://www.w3.org/TR/swbp-vocab-pub/RDFaKennissystemen 2010
BBC MusicKennissystemen 2010
Kennissystemen 2010
Kennissystemen 2010
Kennissystemen 2010
Integration: 303 See OtherKennissystemen 2010
Integration: Inline RDFaAttributes on XHTML elementshttp://www.w3.org/TR/xhtml-rdfa-primerKennissystemen 2010
Integration: RDFa ExampleIn XHTML:<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN"          "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd"><html xmlns:cal="http://www.w3.org/2002/12/cal/ical#">    <head><title>Jo's Friends and Family Blog</title></head>    <body>    <pinstanceof="cal:Vevent">        I'm holding        <span property="cal:summary">one last summer Barbecue</span>,        on        <span property="cal:dtstart" content="20070916T1600-0500">            September 16th at 4pm.        </span>    </p>    </body></html>In RDF:_:blanknode0rdf:typecal:Vevent; cal:summary ”one last summer Barbecue";cal:dtstart "20070916T1600-0500" .Kennissystemen 2010
Legal InformationRetrievalforLaymenKennissystemen 2010
VoorbeeldKennissystemen 2010
So, where’s that data?I repeat: does it really exist?Kennissystemen 2010
Linked Open DataKennissystemen 2010
November 2009: 13.1 Billion triples, 142 Million links Kennissystemen 2010
September 2010: 25 Miljard triples, 395 Miljoenlinks Kennissystemen 2010
ScalabilityHow to deal with massive amounts of data?Consequences for reasoningBillion Triple Challenge(864.8 Million Triples)Consequences for queryingTable lookups, joins etc.… and what about …Dealing with change, provenance, trust?Kennissystemen 2010
A rough idea…I can crash a DL reasoner using an ontology of ~15 classes and 5 individuals (honestly)What if my ontology contains thousands of classes and billions of individuals?Kennissystemen 2010
ReasoningReasoning with inconsistent knowledgeincomplete knowledgeComplete vs. incomplete reasoningKennissystemen 2010
ReasoningWhen?
Realtime vs. in advance
Lightweight reasoning (RDFS, OWL 2 RL)
Implementable using forward chaining rules
Still problems with scalability
Distributed reasoning (DAS-3)
MaRVIN
‘SpeedDate’ distrubution of triples across nodes
MapReduce
Full closure of BTC in 57 minutes
Output: 30B triples
And what to do with the results?Kennissystemen 2010
2 Degrees from Kevin BaconPREFIX p: http://dbpedia.org/property/SELECT ?film1 ?actor1 ?film2 ?actor2WHERE {  	?film1 p:starring <http://dbpedia.org/resource/Kevin_Bacon> .  	?film1 p:starring ?actor1 .  	?film2 p:starring ?actor1 .  	?film2 p:starring ?actor2 .}DBPedia: 150M triplesKennissystemen 2010
Another rough idea…1 Billion triples in MySQL
Load time
… a couple of hours
Simple table lookup (one-variable query)
… about 5 minutes

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