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The Semantic Wikipedia would combine the properties of the Semantic Web and Wiki technology.
Advanced searches - find me italian directors born beween 1956 and 1963, that worked on films staring Jim Carey, on films set in english speaking countries, ...........
Data for external applications/sister projects - potential for revenue ( This is Freebase's revenue model)
Editing Efficiency
Remove duplication of data
Removes need for manual lists to be compiled
Elegance/Comprehension
Solves the awkward category problems:
[[Category:African-American Actors from New York]] → [[Ethnicity:African-American]] [[From:New York]]
[[Category:Films about WWII | Films about US history|Films about UK history|Films about French History]] → [[Films about:WWII |US history|UK history|French History]]
Ontology
It would be very interesting to define an ontology of wikipedia articles, such as:
An article about a literary author contains information of:
biography
main works
style, trends he or she followed
review
bibliography
reference
An article about a literary movement is related to:
authors that participated
historical episodes related to those authors biographies
mention to main works
And so forth: Authors related to towns, towns related to countries, countries to continents... It would help making inferences, associations, content augmentations, etc. It would also combine with robots that create templates, relating existing information into new articles.
It would be a very enriching complement to browsing and content discovery.
Adoption/Integration/Scalability
The adoption of an semantic tools would leave wikipedia vulnerable to beginners mistakes. It therefore seems sensible to limit the rate/extent of its adoption by strategically limiting where/how it is used and/or who is allowed implement it.
Ontology for Wikipedia
Please feel free to develope this ontology: The goal is to have a exhausive account for all classes and properties that would sensibly be included in an ontology for wikipedia
Platypus Wiki "Platypus Wiki is a project to develop an enhanced Wiki Wiki Web with ideas borrowed from the Semantic Web. It offers a simple user interface to create wiki pages with metadata based on W3C standards. It uses RDF (Resource Description Framework), RDF Schema and OWL (Web Ontology Language) to create ontologies and manage metadata. Platypus Wiki is an ongoing open source project started on 23rd December 2003. The project is actually hosted on SourceForge and licensed under GNU GPL."