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Potentials and Benefits of Linked Open DataDr. Sören Auer

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What‘s wrong with Open Data?

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Creating Know l e dgeout of Interlinked Data

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Creating Know l e dge 1st Resource Download Attemptout of Interlinked Data

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Creating Know l e dge 2nd Resource Download Attemptout of Interlinked Data

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After Installing 7zip for opening .gzCreating Know l e dgeout of Interlinked Data files

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Creating Know l e dgeout of Interlinked Data

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Creating Know l e dge 3rd Resource Download Attemptout of Interlinked Data

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5th Resource Download AttemptCreating Know l e dgeout of Interlinked Data

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Creating Know l e dgeout of Interlinked Data

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Creating Know l e dgeout of Interlinked Data Giving up 

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Creating Know l e dge Publishing Data about Kindergartens in XML (1)out of Interlinked Data <kindergarten> <name>Seven Dwarfs</name> <location>...</location> <description>...</description> </kindergarten>

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Creating Know l e dge Publishing Data about Kindergartens in XML (2)out of Interlinked Data <child_care name=„Seven Dwarfs“> <address> <street>...</street> <zip>...</zip> </address> <text>...</text> </child_care>

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Creating Know l e dge Publishing Data about Kindergartens in XML (3)out of Interlinked Data <daycare id=„Seven Dwarfs“ address=„...“> . . . </daycare>

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Creating Know l e dgeout of Interlinked Data <child_care name=„Seven Dwarfs“><kindergarten> <address> <daycare id=„Seven Dwarfs“ <name>Seven Dwarfs</name> <street>...</street> address=„...“> <location>...</location> <zip>...</zip> . . . <description>...</description> </address> </ daycare > <text>...</text></kindergarten> </child_care> Syntactic heterogenity – different trees Semantic heterogenity – different tags and attributes (e.g. kindergarten, child_care, daycare)

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Creating Know l e dge Maybe CSV helps?out of Interlinked Data Kindergarten Location Description … Seven Dwarfs Rosentalgasse 9, … … 04105 … … … … Child_care street Zip text Seven Dwarfs Rosentalgasse 04105 … … … … … Type Name Location Features Daycare Seven Dwarfs 42.052384|13.2736 … 79 … … … …

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Creating Know l e dge A nightmare …out of Interlinked Data Imagine you have 10.000 open data files describing child care from communities all over Europe all in different XML, CSV, Excel, JSON, … formats And then you want to look into polution, road congestion, health care, …

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Creating Know l e dge Distribution of file formats at PublicData.euout of Interlinked Data

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Creating Know l e dgeout of Interlinked Data How can we fix open data?

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Creating Know l e dge How can we fix Open Data?out of Interlinked Data • Increasing data literacy??? • Organizing hackdays, hackathons??? • Publish more data??? Yes, but this won‘t scale  We need also: • Standard formats, which preserve semantic: RDF • Reuse vocabularies • Visualizatuion widgets, mashups, apps, which can make sense out of those vocabularies

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Linked Data in a NutshellCreating Know l e dgeout of Interlinked Data 1. Uses RDF Data Model starts 24.3.2013 organizes OKFN LOD-MeetUp Subject Predicate Object takesPlaceIn Amsterdam 2. Is serialised in triples: OKFN organizes LOD-MeetUp . LOD-MeetUp starts “20130324”^^xsd:date . LOD-MeetUp takesPlaceAt Amsterdam . 3. Uses Content-negotiation

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Creating Know l e dge 7 Dwarfs in RDFout of Interlinked Data Seven_Dwarfs rdf:type Kindergarten Seven_Dwarfs rdfs:label „Seven Dwarfs“ Seven_Dwarfs foaf:location „Rosentalgasse 9“ Seven_Dwarfs rdfs:description „...“ ... Different Kindergarten descriptions also might look different, but there will be definitely less variety than with XML or CSV You can mix and mesh different vocabularies (RDF, RDFS, FOAF) More information can be added without destroying the data structure

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Creating Know l e dge What has to be done?out of Interlinked Data • Publish Open Data in RDF reusing vocabularies which can be understood and combined by apps in unforeseen ways (e.g. visualization widgets) link your data Where we should be use URIs to Where we are now denote things use non-proprietary formats (e.g., CSV instead of Excel) make it available as structured data (e.g., Excel instead of image scan of a table) make your stuff available on the Web (whatever format) under an open license

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Creating Know l e dgeout of Interlinked Data How can we lift Open Data to Linked Open Data?

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Creating Know l e dge All CSV on PublicData.eu is transformed in RDFout of Interlinked Data

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Creating Know l e dgeout of Interlinked Data

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Creating Know l e dge Mapping Wikiout of Interlinked Data • Automatic CSV to RDF transformation won‘t render good results • Mappings Wiki enables the crowdsourcing of mappings

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Creating Know l e dge CSV2RDF Mapping Syntaxout of Interlinked Data 1 {{CSV2RDFHeader}} 2 3 ... 4 5 {{RelCSV2RDF 6 | name = default-mapping 7 | header = 1 8 | omitRows = -1 9 | omitCols = -1 10 | delimiter = 11 | col1 = Department Family 12 | col2 = Entity 13 | col3 = Payment Date^^xsd:date 14 | col4 = rdf:type 15 | col5 = Cost Centre Name 16 | col6 = Supplier 17 | col7 = Transaction No. 18 | col8 = Line Amount 19 | col9 = Invoice Total^^xsd:decimal 20 }}

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Creating Know l e dge How can we make this happen?out of Interlinked Data SemMap OntoWiki Exploration Domain specific … Spatial faceted- Faceted- Statistical … Entity-/faceted- Widgets visualizations browsing browsing visualization Based browsing Data Portal • Dataset analysis (size, vocabularies, properties) • Selection of suitable visualization widgets Open Datasets

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Browsing Statistical Data withCreating Know l e dgeout of Interlinked Data CubeViz

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Creating Know l e dge Browsing Spatial Data with SemMapout of Interlinked Data

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Inter- linking/ FusingCreating Know l e dge Manual Classifi-out of Interlinked Data revision/ cation/ authoring Enrichment LOD Lifecycle Storage/ supported by Quality Querying Debian based Analysis LOD2 Stack http://stack.lod2.eu Evolution / Extraction Repair Search/ Browsing/ Exploration

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Creating Know l e dge Take homeout of Interlinked Data • Open Data will only scale when ist Linked Open Data • The RDF data model helps to reduce syntactic and semantic heterogenity • When Open Data is published as LOD adhering to standard vocabularies, visualization widgets, mashups, apps etc. can be applied to the data at runtime and in possibly unforeseen ways • By ultimately reducing the entrance and usage barrier LOD will facilitate long-tail applications

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Creating Know l e dgeout of Interlinked Data Thank You!!! http://lod2.eu http://aksw.org

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The emerging Web of Data 2007 2008 2008 2009 2008 2009 2008 2010Linking Open Data cloud diagram, byRichard Cyganiak and Anja Jentzsch.

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Creating Know l e dge Why do we need the Linked Open Dataout of Interlinked Data Problem: Try to search for these things on the current Web: • Apartments near German-English bilingual childcare in Leipzig • ERP service providers with offices in Vienna and London • Researchers working on multimedia topics in Eastern Europe Information is available on the Web, but opaque to current search. Solution: complement text on Web pages with structured linked open data & intelligently combine/integrate/join such structured information from different sources: HTML Search engine HTML RDF RDF Web Web leipzig.de server Immobilienscout.de server Has everything about Knows all about real estate childcare in Leipzig. DB offers in Germany DB