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Lessons learned from Semantic Wiki

Lessons learned from Semantic Wiki. Jie Bao and Li Ding June 19, 2008. Background. Wiki => MediaWiki => Semantic MediaWiki (SMW) => SMW workbench How semantic wiki differs from wiki? Embed structured metadata to wiki pages Propagate metadata to other wiki pages via semantic query.

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Lessons learned from Semantic Wiki

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  1. Lessons learned from Semantic Wiki Jie Bao and Li Ding June 19, 2008

  2. Background • Wiki => MediaWiki => Semantic MediaWiki (SMW) => SMW workbench • How semantic wiki differs from wiki? • Embed structured metadata to wiki pages • Propagate metadata to other wiki pages via semantic query

  3. Semantic Wiki @ RPI • Social Webtop* • Workbench on the Web – more data • Social environment – more human interaction • Semantic Web enabled – more structure • Highlights • Support Users at different levels • Many end users • Concentrate on data (easy data input/output/provenance) • Some application developers • Light-weight data modeling • Fast prototyping • Few SemWiki experts • Application incubator * http://en.wikipedia.org/wiki/Web_desktop

  4. Before Use RDF syntax Use Editor After From structured data Use SMW syntax Use Form For End UsersImproved Semantic Data Generation <?xml version="1.0"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/"> <rdf:Description rdf:about="http://www.w3.org/"> <dc:title>World Wide Web Consortium</dc:title> </rdf:Description> </rdf:RDF>

  5. Data can be easily propagated via semantic query, e.g. the project and publications are included from others’ input Data can be propagated smartly using wiki-script based inference, e.g. “James A. Hendler” has an alias “Jim Hendler” For End UsersSmart Data Propagation

  6. For End UsersSupports Provenance Tracking • Provenance metadata natively captured and semantically encoded by PML • Enable complex query on data and provenance

  7. For DevelopersLight-weight Data Modeling • A SMW page can be viewed as: • One row in relational table - semantic template • One object in frame systems – semantic template + category • A node in RDF graph – SMW syntax

  8. Learning Curve (before) Web languages: HTML, CSS Semantic web languages: RDF, RDFS, OWL, SPARQL, Web tools: web server (apache, tomcat), database (mysql), languages (PHP, Javascript) Semantic web tools: editor (protégé, swoop), triple store (sesame), ontology reasoners (pellet, racer), Programming API (jena), Learning Curve (after) Wiki syntax Semantic wiki syntax and semantic form/template syntax Web tools hidden by Wiki Simplified SW tools via light-weight Wiki programming: Online authoring Triple store Semantic query with simple RDFS reasoning For DevelopersEnables Fast Prototyping

  9. SemWiki as Application Incubator • Semantic Group Portal • Group portal (tw.rpi.edu): Project, People, Event • Multi-group portal (tw.rpi.edu/portal): protection • Mash-ups • RPI Map (map.rpi.edu) – import data • Wine Wiki (onto.rpi.edu/wiki/wine) – export data • More Prototypes on tw.rpi.edu • Semantic Calendar – user experience • Semantic Blog – protection • Collaborative literature annotation – convergence • Semantic Issue tracker – transactional data

  10. RPI Map = SemWiki + Google Map • http://map.rpi.edu/ • Conventional mash-up • Wiki data: location, name, alias, photo • Data imported from GoogleMap: map, location service • Technical highlights • Import GoogleMap via MediaWiki’s parser function extensions • Allow use-contributed data via semantic form/template

  11. SemWiki + OWL = Wine Agent • http://onto.rpi.edu/wiki/wine • Semantic mash-up • Collaboratively maintained taxonomy (class hierarchy), e.g. Food • Can be integrated with external complex ontology, e.g. wine.owl • Data exported to TW Wine agent (http://onto.rpi.edu/WineAgent/WineAgent.html ) • Technical highlights • Used as KB by TW Wine Agent • Preserve provenance

  12. Collaborative Literature Annotation • Context • A publication can be tagged with different topics in topic hierarchy • Users may hold different topic hierarchy • Goal: to converge and branch topic hierarchy among users • Example • http://tw.rpi.edu/wiki/index.php/Literature. we may build two topic hierarchies • TW Topic: for TW related topics • Topic: for general computer science

  13. For SemWiki ExpertsA lot of work has been done • 9 June 2008: SMW 1.2 preview: faster more powerful queries • Semantic Form and Template extension allows users to have forms for adding and editing data on wiki, without any programming • SMW halo extension improves UI for ease of use of Semantic Wikis for a large community of users • Wiki parsing function extensions are heavily used to enrich SemWiki

  14. For SemWiki ExpertsMany Remaining Issues! • Convergence • How to help users to manage public and personal data in information sharing context, e.g. a group website • Scalability • how to support more semantic data with acceptable response time • Data Portability • How to import/export semantic web data from/to external sources • How to allow user registered across multiple wikis with preferences, e.g. data access privilege • Data Protection • How to protect data read/write access

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