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Metadata in Wikipedia

                                    Daniel Kinzler

                               Wikipedia

                               Traditional Metadata

Metadata in Wikipedia          Document and Revision
                               Media Metadata
                               Accessing Metadata
    data in, data out          Link Structure
                               Hyperlinks
                               Categories
                               Inter-Language Links
                               WikiWord
      Daniel Kinzler           Structured Data
                               Records
                               Infoboxes
  Wikimedia Deutschland e.V.   DBPedia
                               Semantic MediaWiki
                               WikiData
   September 26. 2008          Conclusion
                               We Have
                               We Need
                               Thank You
Metadata in Wikipedia
Wikipedia
                                                             Daniel Kinzler

                                                        Wikipedia

                                                        Traditional Metadata
                                                        Document and Revision
                                                        Media Metadata
                                                        Accessing Metadata

                                                        Link Structure
                                                        Hyperlinks
                                                        Categories
Wikipedia is the free encyclopedia anyone can edit      Inter-Language Links
                                                        WikiWord

    Founded in 2001                                     Structured Data
                                                        Records
    Has become the standard online reference            Infoboxes
                                                        DBPedia
                                                        Semantic MediaWiki
    Number 8 website (Alexa), 50K requests per second   WikiData

                                                        Conclusion
    Exists in 250 languages, has 10 million articles    We Have
                                                        We Need
    Run by Wikimedia, runs on MediaWiki                 Thank You


    Free content, free software
Metadata in Wikipedia
Document Metadata
                                                               Daniel Kinzler

                                                          Wikipedia

                                                          Traditional Metadata
                                                          Document and Revision
                                                          Media Metadata
                                                          Accessing Metadata

Traditional (document) metadata is available throughout   Link Structure
                                                          Hyperlinks
Wikipedia                                                 Categories
                                                          Inter-Language Links

    Document information                                  WikiWord

                                                          Structured Data
         Title                                            Records
         URL                                              Infoboxes
                                                          DBPedia
                                                          Semantic MediaWiki
    Revision information                                  WikiData

         Author                                           Conclusion
                                                          We Have
         Timestamp                                        We Need
                                                          Thank You
Metadata in Wikipedia
Document Metadata
                                                         Daniel Kinzler

                                                    Wikipedia
Metadata for media files is maintained on-page, as   Traditional Metadata
content:                                            Document and Revision
                                                    Media Metadata
                                                    Accessing Metadata
    Source, License, Contributors, . . .            Link Structure
                                                    Hyperlinks
                                                    Categories
                                                    Inter-Language Links
                                                    WikiWord

                                                    Structured Data
                                                    Records
                                                    Infoboxes
                                                    DBPedia
                                                    Semantic MediaWiki
                                                    WikiData

                                                    Conclusion
                                                    We Have
                                                    We Need
                                                    Thank You
Metadata in Wikipedia
Images Metadata
                                    Daniel Kinzler

                               Wikipedia

                               Traditional Metadata
                               Document and Revision
Metadata for image formats     Media Metadata
                               Accessing Metadata

    Resolution                 Link Structure
                               Hyperlinks
    EXIF                       Categories
                               Inter-Language Links
         Author, Copyright     WikiWord

                               Structured Data
         Timestamp             Records
         Exposure, Aperture,   Infoboxes
                               DBPedia
         Flash                 Semantic MediaWiki
                               WikiData
         Camera model
                               Conclusion
         ...                   We Have
                               We Need
Metadata for audio and         Thank You

video formats is not yet
supported.
Metadata in Wikipedia
Online Export Interface
                                                         Daniel Kinzler

                                                    Wikipedia

                                                    Traditional Metadata
                                                    Document and Revision
                                                    Media Metadata
                                                    Accessing Metadata

                                                    Link Structure
MediaWiki’s page export facility provides limited   Hyperlinks
                                                    Categories
metadata                                            Inter-Language Links
                                                    WikiWord

    Special:Export                                  Structured Data
                                                    Records
    Pages and revisions                             Infoboxes
                                                    DBPedia
                                                    Semantic MediaWiki
    XML wrapper around wikitext                     WikiData

                                                    Conclusion
    Some basic metadata                             We Have
                                                    We Need
                                                    Thank You
Metadata in Wikipedia
Online Export Interface XML
                                                         Daniel Kinzler

                                                    Wikipedia
http://en.wikipedia.org/wiki/Special:               Traditional Metadata
Export/Berlin                                       Document and Revision
                                                    Media Metadata
                                                    Accessing Metadata
  <page>
    <title>Berlin</title>                           Link Structure
                                                    Hyperlinks
    <id>3354</id>                                   Categories
    <revision>                                      Inter-Language Links
                                                    WikiWord
      <id>240627831</id>
      <timestamp>2008-09-24T06:44:58Z</timestamp>   Structured Data
                                                    Records
      <contributor>
                                                    Infoboxes
        <username>Ling.Nut</username>               DBPedia
        <id>1929579</id>                            Semantic MediaWiki
                                                    WikiData
      </contributor>
      <minor/>                                      Conclusion
                                                    We Have
      <comment>clean up, typos fixed</comment>      We Need
      <text xml:space=quot;preservequot;>                   Thank You
{{pp-semi-protected|small=yes}}
{{otheruses1|the capital of Germany}}
{{Infobox German Bundesland
Metadata in Wikipedia
MediaWiki Web API
                                                             Daniel Kinzler

                                                        Wikipedia

                                                        Traditional Metadata
                                                        Document and Revision
                                                        Media Metadata
                                                        Accessing Metadata

                                                        Link Structure
MediaWiki’s web API for bots/scripts                    Hyperlinks
                                                        Categories
    api.php                                             Inter-Language Links
                                                        WikiWord

    supports complex queries                            Structured Data
                                                        Records
    lots of properties                                  Infoboxes
                                                        DBPedia
                                                        Semantic MediaWiki
    several output formats (JSON, YAML, WDDX, . . . )   WikiData

                                                        Conclusion
    but no RDF                                          We Have
                                                        We Need
                                                        Thank You
Metadata in Wikipedia
MediaWiki Web API XML
                                                     Daniel Kinzler


http://en.wikipedia.org/w/api.php?action=       Wikipedia

query&titles=Berlin&prop=info|                  Traditional Metadata
revisions&rvlimit=5&format=xml                  Document and Revision
                                                Media Metadata
                                                Accessing Metadata
<page pageid=quot;3354quot;
                                                Link Structure
    ns=quot;0quot;                                      Hyperlinks
    title=quot;Berlinquot;                              Categories
    touched=quot;2008-09-24T06:44:58Zquot;              Inter-Language Links
                                                WikiWord
    lastrevid=quot;240627831quot;
                                                Structured Data
    counter=quot;2317quot;                              Records
    length=quot;91446quot;>                             Infoboxes
  <revisions>                                   DBPedia
                                                Semantic MediaWiki
    <rev revid=quot;240627831quot;                      WikiData
        minor=quot;quot;
                                                Conclusion
        user=quot;Ling.Nutquot;                         We Have
        timestamp=quot;2008-09-24T06:44:58Zquot;        We Need
        comment=quot;clean up, typos fixedquot; />      Thank You

    <rev revid=quot;239984512quot;
        user=quot;Lear 21quot;
        timestamp=quot;2008-09-21T12:03:45Zquot;
        comment=quot;/* Transportation */ refquot; />
Metadata in Wikipedia
MediaWiki RDF Extension
                                                      Daniel Kinzler

                                                 Wikipedia

                                                 Traditional Metadata
                                                 Document and Revision
                                                 Media Metadata
The RDF Extension provides access to metadata    Accessing Metadata

                                                 Link Structure
    Per-page RDF output                          Hyperlinks
                                                 Categories
    Document info mainly in DC and CC vocab      Inter-Language Links
                                                 WikiWord

    Also links, categories, images, etc          Structured Data
                                                 Records
    Output in XML, Turtle or NTriples            Infoboxes
                                                 DBPedia
                                                 Semantic MediaWiki
    Supports custom RDF embedded in wiki pages   WikiData

                                                 Conclusion
    Compare http://www.communitywiki.org/en/     We Have
    DublinCoreForWiki                            We Need
                                                 Thank You

Not on Wikipedia, used by WikiTravel
Metadata in Wikipedia
MediaWiki RDF Extension XML
                                                                    Daniel Kinzler

                                                               Wikipedia

                                                               Traditional Metadata
                                                               Document and Revision
http://wikitravel.org/en/Special:Rdf/Berlin                    Media Metadata
                                                               Accessing Metadata

<rdf:Description                                               Link Structure
                                                               Hyperlinks
    rdf:about=quot;http://wikitravel.org/en/Berlinquot;>               Categories
  <dc:date                                                     Inter-Language Links
      rdf:datatype=quot;http://purl.org/dc/elements/1.1/W3CDTFquot;>   WikiWord

    2008-09-23T18:04:01Z                                       Structured Data
                                                               Records
  </dc:date>
                                                               Infoboxes
  <dc:rights>                                                  DBPedia
    Creative Commons Attribution-ShareAlike 1.0                Semantic MediaWiki
                                                               WikiData
  </dc:rights>
  <dc:title xml:lang=quot;enquot;>                                     Conclusion
                                                               We Have
    Berlin                                                     We Need
  </dc:title>                                                  Thank You
Metadata in Wikipedia
Structural Information
                                                            Daniel Kinzler

                                                       Wikipedia

                                                       Traditional Metadata
                                                       Document and Revision
                                                       Media Metadata
                                                       Accessing Metadata

                                                       Link Structure
                                                       Hyperlinks
                                                       Categories
    Wiki pages contain several types of links          Inter-Language Links
                                                       WikiWord

    The structure of hyperlinks encodes relations      Structured Data
                                                       Records
    Links connect on textual and conceptual level      Infoboxes
                                                       DBPedia
                                                       Semantic MediaWiki
    Links maintened by users, relations are implicit   WikiData

                                                       Conclusion
                                                       We Have
                                                       We Need
                                                       Thank You
Metadata in Wikipedia
Page Links
                                                         Daniel Kinzler

                                                    Wikipedia

                                                    Traditional Metadata
                                                    Document and Revision
                                                    Media Metadata
                                                    Accessing Metadata

Hyperlinks cross-reference pages                    Link Structure
                                                    Hyperlinks
    Navigational, but also conceptual               Categories
                                                    Inter-Language Links
                                                    WikiWord
    Mutually linked pages → related concepts
                                                    Structured Data
    Link label and link target → word and meaning   Records
                                                    Infoboxes
                                                    DBPedia
    Beware identity crisis when choosing URIs       Semantic MediaWiki
                                                    WikiData

                                                    Conclusion
[[Berlin Wall|The Wall]]                            We Have
                                                    We Need
                                                    Thank You
Metadata in Wikipedia
Category Links
                                                            Daniel Kinzler

                                                       Wikipedia

                                                       Traditional Metadata
                                                       Document and Revision
                                                       Media Metadata
                                                       Accessing Metadata
Pages are assigned to one or more categories.
                                                       Link Structure
                                                       Hyperlinks
    Categories form a poly-hierarchy (by convention)   Categories
                                                       Inter-Language Links
    Categories of pages → Subsumtion of concepts       WikiWord

                                                       Structured Data
    Structure often unclear or broken                  Records
                                                       Infoboxes
    No intersection, no transitive inclusion           DBPedia
                                                       Semantic MediaWiki
                                                       WikiData

[[Category:Capitals in Europe]]                        Conclusion
                                                       We Have
[[Category:States of Germany]]                         We Need
                                                       Thank You
Metadata in Wikipedia
Inter-Language Links
                                                                 Daniel Kinzler

                                                            Wikipedia

                                                            Traditional Metadata
                                                            Document and Revision
                                                            Media Metadata
Inter-language links refer to the same page in a different   Accessing Metadata

language (on another wiki)                                  Link Structure
                                                            Hyperlinks
    Granularity and coverage differ greatly                  Categories
                                                            Inter-Language Links
                                                            WikiWord
    Mutually linked pages probably describe the same
                                                            Structured Data
    concept                                                 Records
                                                            Infoboxes
    Maintained manually, and per bot                        DBPedia
                                                            Semantic MediaWiki
                                                            WikiData
Would a centralized system be better?
                                                            Conclusion
                                                            We Have
[[de:Berliner Mauer]]                                       We Need
                                                            Thank You
[[fr:Mur de Berlin]]
Metadata in Wikipedia
WikiWord
                                                                Daniel Kinzler

                                                           Wikipedia

                                                           Traditional Metadata
                                                           Document and Revision
                                                           Media Metadata
WikiWord builds a thesaurus by mining the link structure   Accessing Metadata

                                                           Link Structure
    Every page describes a concept                         Hyperlinks
                                                           Categories
                                                           Inter-Language Links
    Link labels are terms refering to those concepts       WikiWord

                                                           Structured Data
    Links and categories define relations                   Records
                                                           Infoboxes
    Multilingual thesaurus by merging languages            DBPedia
                                                           Semantic MediaWiki
    Export to SKOS                                         WikiData

                                                           Conclusion
    No web interface yet                                   We Have
                                                           We Need
                                                           Thank You
    http://brightbyte.de/page/WikiWord
Metadata in Wikipedia
Data Records
                                                           Daniel Kinzler

                                                      Wikipedia

Wikipedia uses templates to present structured data   Traditional Metadata
                                                      Document and Revision
records                                               Media Metadata
                                                      Accessing Metadata

     Maintained directly by users                     Link Structure
                                                      Hyperlinks
     Template parameters can be extracted             Categories
                                                      Inter-Language Links
                                                      WikiWord
     MediaWiki stores them as plain text
                                                      Structured Data
                                                      Records
     External mining tools needed                     Infoboxes
                                                      DBPedia
                                                      Semantic MediaWiki
{{Infobox German Bundesland                           WikiData
|Name = Berlin
                                                      Conclusion
|image_photo = Cityscapeberlin2006.JPG                We Have
|area = 891.82                                        We Need
                                                      Thank You
|population = 3416300
|elevation = 34 - 115
|GDP = 81.7
...
Metadata in Wikipedia
Infoboxes
                                             Daniel Kinzler

                                        Wikipedia

                                        Traditional Metadata
                                        Document and Revision
                                        Media Metadata
                                        Accessing Metadata

                                        Link Structure
Infoboxes present a terse overview of   Hyperlinks
                                        Categories

properties                              Inter-Language Links
                                        WikiWord

    Used for Cities, animals, bands,    Structured Data
                                        Records
    books, chemicals, . . .             Infoboxes
                                        DBPedia
                                        Semantic MediaWiki
    Qualifiers are problematic:          WikiData

    date of measurement, error          Conclusion
                                        We Have
    margin, unit, source, etc           We Need
                                        Thank You
Metadata in Wikipedia
Personendaten
                                                                Daniel Kinzler

                                                           Wikipedia
“Personendaten” are biographic records on the German       Traditional Metadata
                                                           Document and Revision
Wikipedia                                                  Media Metadata
                                                           Accessing Metadata
     Works like a hidden infobox                           Link Structure
                                                           Hyperlinks
     Contains date/place of birth/death, aliases, etc.     Categories
                                                           Inter-Language Links
     Maintained by a WikiProject                           WikiWord

                                                           Structured Data
     Automated extraction (every now and then)             Records
                                                           Infoboxes
                                                           DBPedia
{{Personendaten                                            Semantic MediaWiki
                                                           WikiData
|NAME=Einstein, Albert
|ALTERNATIVNAMEN=                                          Conclusion
                                                           We Have
|KURZBESCHREIBUNG=Physiker
                                                           We Need
|GEBURTSDATUM=14. M¨rz 1879
                    a                                      Thank You
|GEBURTSORT=[[Ulm]]
|STERBEDATUM=18. April 1955
|STERBEORT=[[Princeton (New Jersey)|Princeton]], [[USA]]
}}
Metadata in Wikipedia
DBPedia
                                                        Daniel Kinzler

                                                   Wikipedia

                                                   Traditional Metadata
                                                   Document and Revision
                                                   Media Metadata
                                                   Accessing Metadata

                                                   Link Structure
                                                   Hyperlinks
                                                   Categories

DBPedia is a project that mines RDF triples from   Inter-Language Links
                                                   WikiWord

Infoboxes                                          Structured Data
                                                   Records
    Allows SPARQL queries                          Infoboxes
                                                   DBPedia
                                                   Semantic MediaWiki
    Multiple languages                             WikiData

    100 million triples                            Conclusion
                                                   We Have
                                                   We Need
    Web interface                                  Thank You

    http://dbpedia.org
Metadata in Wikipedia
DBPedia XML
                                                                        Daniel Kinzler

                                                                   Wikipedia

                                                                   Traditional Metadata
http://dbpedia.org/data/Berlin                                     Document and Revision
                                                                   Media Metadata
                                                                   Accessing Metadata
<rdf:Description
                                                                   Link Structure
    rdf:about=quot;http://dbpedia.org/resource/Lothar_Bolzquot;>
                                                                   Hyperlinks
  <n0pred:deathPlace xmlns:n0pred=quot;http://dbpedia.org/property/quot;   Categories
      rdf:resource=quot;http://dbpedia.org/resource/Berlinquot;/>          Inter-Language Links
                                                                   WikiWord
</rdf:Description>
<rdf:Description                                                   Structured Data
                                                                   Records
    rdf:about=quot;http://dbpedia.org/resource/Alfred_Wegenerquot;>        Infoboxes
  <n0pred:birthPlace xmlns:n0pred=quot;http://dbpedia.org/property/quot;   DBPedia
      rdf:resource=quot;http://dbpedia.org/resource/Berlinquot;/>          Semantic MediaWiki
                                                                   WikiData
</rdf:Description>
<rdf:Description                                                   Conclusion
                                                                   We Have
    rdf:about=quot;http://dbpedia.org/resource/Untotenquot;>               We Need
  <n0pred:origin xmlns:n0pred=quot;http://dbpedia.org/property/quot;       Thank You

      rdf:resource=quot;http://dbpedia.org/resource/Berlinquot;/>
</rdf:Description>
Metadata in Wikipedia
Semantic MediaWiki
                                                         Daniel Kinzler

                                                    Wikipedia

                                                    Traditional Metadata
                                                    Document and Revision
                                                    Media Metadata
                                                    Accessing Metadata

                                                    Link Structure
                                                    Hyperlinks
                                                    Categories

Semantic MediaWiki is a MediaWiki extension:        Inter-Language Links
                                                    WikiWord

    Builds an RDF structure                         Structured Data
                                                    Records

    Allows SPARQL queries                           Infoboxes
                                                    DBPedia
                                                    Semantic MediaWiki
    Users enter semantic relations in wiki syntax   WikiData

                                                    Conclusion
    More complex syntax                             We Have
                                                    We Need
    semantic-mediawiki.org                          Thank You


Not supported by Wikipedia
Metadata in Wikipedia
Semantic MediaWiki XML
                                                                              Daniel Kinzler

                                                                          Wikipedia

http://semantic-mediawiki.org/wiki/Special:                               Traditional Metadata
ExportRDF/Berlin                                                          Document and Revision
                                                                          Media Metadata
                                                                          Accessing Metadata
<swivt:Subject rdf:about=quot;&wiki;Berlinquot;>                          Link Structure
  <rdfs:label>Berlin</rdfs:label>                                  Hyperlinks
  <swivt:page rdf:resource=quot;&wikiurl;Berlinquot;/>                     Categories
                                                                   Inter-Language Links
  <rdfs:isDefinedBy rdf:resource=quot;&wikiurl;Special:ExportRDF/Berlinquot;/>
                                                                   WikiWord
  <rdf:type rdf:resource=quot;&wiki;Category-3ACityquot;/>
                                                                  Structured Data
  <property:Capital_of rdf:resource=quot;&wiki;Germanyquot;/>             Records
  <property:Coordinates                                            Infoboxes
      rdf:datatype=quot;http://www.w3.org/2001/XMLSchema#stringquot;>      DBPedia
                                                                   Semantic MediaWiki
    52◦ 31 0 N, 13◦ 24 0 E                                         WikiData
  </property:Coordinates>                                         Conclusion
  <property:Located_in rdf:resource=quot;&wiki;Germanyquot;/>              We Have
  <property:Population                                             We Need
                                                                   Thank You
      rdf:datatype=quot;http://www.w3.org/2001/XMLSchema#doublequot;>
    3391407
  </property:Population>
</swivt:Subject>
Metadata in Wikipedia
WikiData
                                                         Daniel Kinzler

                                                    Wikipedia

                                                    Traditional Metadata
                                                    Document and Revision
                                                    Media Metadata
                                                    Accessing Metadata

                                                    Link Structure
                                                    Hyperlinks
                                                    Categories

WikiData is a MediaWiki extension:                  Inter-Language Links
                                                    WikiWord

    Stores structured data separate from wikitext   Structured Data
                                                    Records

    Reusable across wikis                           Infoboxes
                                                    DBPedia
                                                    Semantic MediaWiki
    Form-based structured data entry                WikiData

                                                    Conclusion
    No export interface                             We Have
                                                    We Need
    omegawiki.org                                   Thank You


Not used by Wikipedia, active on OmegaWiki
Metadata in Wikipedia
We Have
                                            Daniel Kinzler

                                       Wikipedia

                                       Traditional Metadata
                                       Document and Revision
                                       Media Metadata
                                       Accessing Metadata

                                       Link Structure
                                       Hyperlinks
We have. . .                           Categories
                                       Inter-Language Links
     Document Metadata                 WikiWord

                                       Structured Data
     Structural Data                   Records
                                       Infoboxes
     Structured data records           DBPedia
                                       Semantic MediaWiki
                                       WikiData
     Lots of people maintaining this
                                       Conclusion
                                       We Have
                                       We Need
                                       Thank You
Metadata in Wikipedia
We Need
                                           Daniel Kinzler

                                      Wikipedia

                                      Traditional Metadata
                                      Document and Revision
                                      Media Metadata
                                      Accessing Metadata

                                      Link Structure
We need ways to. . .                  Hyperlinks
                                      Categories

    maintain the data easily.         Inter-Language Links
                                      WikiWord

    store structured data sensibly.   Structured Data
                                      Records
    query the data efficiently.         Infoboxes
                                      DBPedia
                                      Semantic MediaWiki
    access the data conveniently.     WikiData

                                      Conclusion
We need people to make it happen.     We Have
                                      We Need
                                      Thank You
Metadata in Wikipedia
Thank You
                                                      Daniel Kinzler

                                                 Wikipedia

                                                 Traditional Metadata
                                                 Document and Revision
                                                 Media Metadata
                                                 Accessing Metadata

                                                 Link Structure
                                                 Hyperlinks
                     The End                     Categories
                                                 Inter-Language Links
                                                 WikiWord

                                                 Structured Data
                                                 Records
                                                 Infoboxes
                                                 DBPedia
                                                 Semantic MediaWiki
                                                 WikiData

       http://brightbyte.de/repos/papers/2008/   Conclusion
                                                 We Have
                                                 We Need
                                                 Thank You

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Metadata in Wikipedia

  • 1. Metadata in Wikipedia Daniel Kinzler Wikipedia Traditional Metadata Metadata in Wikipedia Document and Revision Media Metadata Accessing Metadata data in, data out Link Structure Hyperlinks Categories Inter-Language Links WikiWord Daniel Kinzler Structured Data Records Infoboxes Wikimedia Deutschland e.V. DBPedia Semantic MediaWiki WikiData September 26. 2008 Conclusion We Have We Need Thank You
  • 2. Metadata in Wikipedia Wikipedia Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks Categories Wikipedia is the free encyclopedia anyone can edit Inter-Language Links WikiWord Founded in 2001 Structured Data Records Has become the standard online reference Infoboxes DBPedia Semantic MediaWiki Number 8 website (Alexa), 50K requests per second WikiData Conclusion Exists in 250 languages, has 10 million articles We Have We Need Run by Wikimedia, runs on MediaWiki Thank You Free content, free software
  • 3. Metadata in Wikipedia Document Metadata Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Traditional (document) metadata is available throughout Link Structure Hyperlinks Wikipedia Categories Inter-Language Links Document information WikiWord Structured Data Title Records URL Infoboxes DBPedia Semantic MediaWiki Revision information WikiData Author Conclusion We Have Timestamp We Need Thank You
  • 4. Metadata in Wikipedia Document Metadata Daniel Kinzler Wikipedia Metadata for media files is maintained on-page, as Traditional Metadata content: Document and Revision Media Metadata Accessing Metadata Source, License, Contributors, . . . Link Structure Hyperlinks Categories Inter-Language Links WikiWord Structured Data Records Infoboxes DBPedia Semantic MediaWiki WikiData Conclusion We Have We Need Thank You
  • 5. Metadata in Wikipedia Images Metadata Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Metadata for image formats Media Metadata Accessing Metadata Resolution Link Structure Hyperlinks EXIF Categories Inter-Language Links Author, Copyright WikiWord Structured Data Timestamp Records Exposure, Aperture, Infoboxes DBPedia Flash Semantic MediaWiki WikiData Camera model Conclusion ... We Have We Need Metadata for audio and Thank You video formats is not yet supported.
  • 6. Metadata in Wikipedia Online Export Interface Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure MediaWiki’s page export facility provides limited Hyperlinks Categories metadata Inter-Language Links WikiWord Special:Export Structured Data Records Pages and revisions Infoboxes DBPedia Semantic MediaWiki XML wrapper around wikitext WikiData Conclusion Some basic metadata We Have We Need Thank You
  • 7. Metadata in Wikipedia Online Export Interface XML Daniel Kinzler Wikipedia http://en.wikipedia.org/wiki/Special: Traditional Metadata Export/Berlin Document and Revision Media Metadata Accessing Metadata <page> <title>Berlin</title> Link Structure Hyperlinks <id>3354</id> Categories <revision> Inter-Language Links WikiWord <id>240627831</id> <timestamp>2008-09-24T06:44:58Z</timestamp> Structured Data Records <contributor> Infoboxes <username>Ling.Nut</username> DBPedia <id>1929579</id> Semantic MediaWiki WikiData </contributor> <minor/> Conclusion We Have <comment>clean up, typos fixed</comment> We Need <text xml:space=quot;preservequot;> Thank You {{pp-semi-protected|small=yes}} {{otheruses1|the capital of Germany}} {{Infobox German Bundesland
  • 8. Metadata in Wikipedia MediaWiki Web API Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure MediaWiki’s web API for bots/scripts Hyperlinks Categories api.php Inter-Language Links WikiWord supports complex queries Structured Data Records lots of properties Infoboxes DBPedia Semantic MediaWiki several output formats (JSON, YAML, WDDX, . . . ) WikiData Conclusion but no RDF We Have We Need Thank You
  • 9. Metadata in Wikipedia MediaWiki Web API XML Daniel Kinzler http://en.wikipedia.org/w/api.php?action= Wikipedia query&titles=Berlin&prop=info| Traditional Metadata revisions&rvlimit=5&format=xml Document and Revision Media Metadata Accessing Metadata <page pageid=quot;3354quot; Link Structure ns=quot;0quot; Hyperlinks title=quot;Berlinquot; Categories touched=quot;2008-09-24T06:44:58Zquot; Inter-Language Links WikiWord lastrevid=quot;240627831quot; Structured Data counter=quot;2317quot; Records length=quot;91446quot;> Infoboxes <revisions> DBPedia Semantic MediaWiki <rev revid=quot;240627831quot; WikiData minor=quot;quot; Conclusion user=quot;Ling.Nutquot; We Have timestamp=quot;2008-09-24T06:44:58Zquot; We Need comment=quot;clean up, typos fixedquot; /> Thank You <rev revid=quot;239984512quot; user=quot;Lear 21quot; timestamp=quot;2008-09-21T12:03:45Zquot; comment=quot;/* Transportation */ refquot; />
  • 10. Metadata in Wikipedia MediaWiki RDF Extension Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata The RDF Extension provides access to metadata Accessing Metadata Link Structure Per-page RDF output Hyperlinks Categories Document info mainly in DC and CC vocab Inter-Language Links WikiWord Also links, categories, images, etc Structured Data Records Output in XML, Turtle or NTriples Infoboxes DBPedia Semantic MediaWiki Supports custom RDF embedded in wiki pages WikiData Conclusion Compare http://www.communitywiki.org/en/ We Have DublinCoreForWiki We Need Thank You Not on Wikipedia, used by WikiTravel
  • 11. Metadata in Wikipedia MediaWiki RDF Extension XML Daniel Kinzler Wikipedia Traditional Metadata Document and Revision http://wikitravel.org/en/Special:Rdf/Berlin Media Metadata Accessing Metadata <rdf:Description Link Structure Hyperlinks rdf:about=quot;http://wikitravel.org/en/Berlinquot;> Categories <dc:date Inter-Language Links rdf:datatype=quot;http://purl.org/dc/elements/1.1/W3CDTFquot;> WikiWord 2008-09-23T18:04:01Z Structured Data Records </dc:date> Infoboxes <dc:rights> DBPedia Creative Commons Attribution-ShareAlike 1.0 Semantic MediaWiki WikiData </dc:rights> <dc:title xml:lang=quot;enquot;> Conclusion We Have Berlin We Need </dc:title> Thank You
  • 12. Metadata in Wikipedia Structural Information Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks Categories Wiki pages contain several types of links Inter-Language Links WikiWord The structure of hyperlinks encodes relations Structured Data Records Links connect on textual and conceptual level Infoboxes DBPedia Semantic MediaWiki Links maintened by users, relations are implicit WikiData Conclusion We Have We Need Thank You
  • 13. Metadata in Wikipedia Page Links Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Hyperlinks cross-reference pages Link Structure Hyperlinks Navigational, but also conceptual Categories Inter-Language Links WikiWord Mutually linked pages → related concepts Structured Data Link label and link target → word and meaning Records Infoboxes DBPedia Beware identity crisis when choosing URIs Semantic MediaWiki WikiData Conclusion [[Berlin Wall|The Wall]] We Have We Need Thank You
  • 14. Metadata in Wikipedia Category Links Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Pages are assigned to one or more categories. Link Structure Hyperlinks Categories form a poly-hierarchy (by convention) Categories Inter-Language Links Categories of pages → Subsumtion of concepts WikiWord Structured Data Structure often unclear or broken Records Infoboxes No intersection, no transitive inclusion DBPedia Semantic MediaWiki WikiData [[Category:Capitals in Europe]] Conclusion We Have [[Category:States of Germany]] We Need Thank You
  • 15. Metadata in Wikipedia Inter-Language Links Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Inter-language links refer to the same page in a different Accessing Metadata language (on another wiki) Link Structure Hyperlinks Granularity and coverage differ greatly Categories Inter-Language Links WikiWord Mutually linked pages probably describe the same Structured Data concept Records Infoboxes Maintained manually, and per bot DBPedia Semantic MediaWiki WikiData Would a centralized system be better? Conclusion We Have [[de:Berliner Mauer]] We Need Thank You [[fr:Mur de Berlin]]
  • 16. Metadata in Wikipedia WikiWord Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata WikiWord builds a thesaurus by mining the link structure Accessing Metadata Link Structure Every page describes a concept Hyperlinks Categories Inter-Language Links Link labels are terms refering to those concepts WikiWord Structured Data Links and categories define relations Records Infoboxes Multilingual thesaurus by merging languages DBPedia Semantic MediaWiki Export to SKOS WikiData Conclusion No web interface yet We Have We Need Thank You http://brightbyte.de/page/WikiWord
  • 17. Metadata in Wikipedia Data Records Daniel Kinzler Wikipedia Wikipedia uses templates to present structured data Traditional Metadata Document and Revision records Media Metadata Accessing Metadata Maintained directly by users Link Structure Hyperlinks Template parameters can be extracted Categories Inter-Language Links WikiWord MediaWiki stores them as plain text Structured Data Records External mining tools needed Infoboxes DBPedia Semantic MediaWiki {{Infobox German Bundesland WikiData |Name = Berlin Conclusion |image_photo = Cityscapeberlin2006.JPG We Have |area = 891.82 We Need Thank You |population = 3416300 |elevation = 34 - 115 |GDP = 81.7 ...
  • 18. Metadata in Wikipedia Infoboxes Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Infoboxes present a terse overview of Hyperlinks Categories properties Inter-Language Links WikiWord Used for Cities, animals, bands, Structured Data Records books, chemicals, . . . Infoboxes DBPedia Semantic MediaWiki Qualifiers are problematic: WikiData date of measurement, error Conclusion We Have margin, unit, source, etc We Need Thank You
  • 19. Metadata in Wikipedia Personendaten Daniel Kinzler Wikipedia “Personendaten” are biographic records on the German Traditional Metadata Document and Revision Wikipedia Media Metadata Accessing Metadata Works like a hidden infobox Link Structure Hyperlinks Contains date/place of birth/death, aliases, etc. Categories Inter-Language Links Maintained by a WikiProject WikiWord Structured Data Automated extraction (every now and then) Records Infoboxes DBPedia {{Personendaten Semantic MediaWiki WikiData |NAME=Einstein, Albert |ALTERNATIVNAMEN= Conclusion We Have |KURZBESCHREIBUNG=Physiker We Need |GEBURTSDATUM=14. M¨rz 1879 a Thank You |GEBURTSORT=[[Ulm]] |STERBEDATUM=18. April 1955 |STERBEORT=[[Princeton (New Jersey)|Princeton]], [[USA]] }}
  • 20. Metadata in Wikipedia DBPedia Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks Categories DBPedia is a project that mines RDF triples from Inter-Language Links WikiWord Infoboxes Structured Data Records Allows SPARQL queries Infoboxes DBPedia Semantic MediaWiki Multiple languages WikiData 100 million triples Conclusion We Have We Need Web interface Thank You http://dbpedia.org
  • 21. Metadata in Wikipedia DBPedia XML Daniel Kinzler Wikipedia Traditional Metadata http://dbpedia.org/data/Berlin Document and Revision Media Metadata Accessing Metadata <rdf:Description Link Structure rdf:about=quot;http://dbpedia.org/resource/Lothar_Bolzquot;> Hyperlinks <n0pred:deathPlace xmlns:n0pred=quot;http://dbpedia.org/property/quot; Categories rdf:resource=quot;http://dbpedia.org/resource/Berlinquot;/> Inter-Language Links WikiWord </rdf:Description> <rdf:Description Structured Data Records rdf:about=quot;http://dbpedia.org/resource/Alfred_Wegenerquot;> Infoboxes <n0pred:birthPlace xmlns:n0pred=quot;http://dbpedia.org/property/quot; DBPedia rdf:resource=quot;http://dbpedia.org/resource/Berlinquot;/> Semantic MediaWiki WikiData </rdf:Description> <rdf:Description Conclusion We Have rdf:about=quot;http://dbpedia.org/resource/Untotenquot;> We Need <n0pred:origin xmlns:n0pred=quot;http://dbpedia.org/property/quot; Thank You rdf:resource=quot;http://dbpedia.org/resource/Berlinquot;/> </rdf:Description>
  • 22. Metadata in Wikipedia Semantic MediaWiki Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks Categories Semantic MediaWiki is a MediaWiki extension: Inter-Language Links WikiWord Builds an RDF structure Structured Data Records Allows SPARQL queries Infoboxes DBPedia Semantic MediaWiki Users enter semantic relations in wiki syntax WikiData Conclusion More complex syntax We Have We Need semantic-mediawiki.org Thank You Not supported by Wikipedia
  • 23. Metadata in Wikipedia Semantic MediaWiki XML Daniel Kinzler Wikipedia http://semantic-mediawiki.org/wiki/Special: Traditional Metadata ExportRDF/Berlin Document and Revision Media Metadata Accessing Metadata <swivt:Subject rdf:about=quot;&wiki;Berlinquot;> Link Structure <rdfs:label>Berlin</rdfs:label> Hyperlinks <swivt:page rdf:resource=quot;&wikiurl;Berlinquot;/> Categories Inter-Language Links <rdfs:isDefinedBy rdf:resource=quot;&wikiurl;Special:ExportRDF/Berlinquot;/> WikiWord <rdf:type rdf:resource=quot;&wiki;Category-3ACityquot;/> Structured Data <property:Capital_of rdf:resource=quot;&wiki;Germanyquot;/> Records <property:Coordinates Infoboxes rdf:datatype=quot;http://www.w3.org/2001/XMLSchema#stringquot;> DBPedia Semantic MediaWiki 52◦ 31 0 N, 13◦ 24 0 E WikiData </property:Coordinates> Conclusion <property:Located_in rdf:resource=quot;&wiki;Germanyquot;/> We Have <property:Population We Need Thank You rdf:datatype=quot;http://www.w3.org/2001/XMLSchema#doublequot;> 3391407 </property:Population> </swivt:Subject>
  • 24. Metadata in Wikipedia WikiData Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks Categories WikiData is a MediaWiki extension: Inter-Language Links WikiWord Stores structured data separate from wikitext Structured Data Records Reusable across wikis Infoboxes DBPedia Semantic MediaWiki Form-based structured data entry WikiData Conclusion No export interface We Have We Need omegawiki.org Thank You Not used by Wikipedia, active on OmegaWiki
  • 25. Metadata in Wikipedia We Have Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks We have. . . Categories Inter-Language Links Document Metadata WikiWord Structured Data Structural Data Records Infoboxes Structured data records DBPedia Semantic MediaWiki WikiData Lots of people maintaining this Conclusion We Have We Need Thank You
  • 26. Metadata in Wikipedia We Need Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure We need ways to. . . Hyperlinks Categories maintain the data easily. Inter-Language Links WikiWord store structured data sensibly. Structured Data Records query the data efficiently. Infoboxes DBPedia Semantic MediaWiki access the data conveniently. WikiData Conclusion We need people to make it happen. We Have We Need Thank You
  • 27. Metadata in Wikipedia Thank You Daniel Kinzler Wikipedia Traditional Metadata Document and Revision Media Metadata Accessing Metadata Link Structure Hyperlinks The End Categories Inter-Language Links WikiWord Structured Data Records Infoboxes DBPedia Semantic MediaWiki WikiData http://brightbyte.de/repos/papers/2008/ Conclusion We Have We Need Thank You