> However, in SMW wikis, categories are still appropriate for one > kind of semantic tagging - "Instance of" relationships.
Does that mean that in a SMW wiki, there is a restriction to only use a category for "instance of"? Is this restriction documented anywhere? Will it be proper wiki etiquette to remove an article from a category if it is used for a relationship other than "instance of"? - Jeff Yaron Koren wrote: > This issue has come up before - it's true that using categories to > indicate type seems to somewhat fly in the face of the principle of > using attributes and relations for everything. They're used, in place > of "Instance of" or "Is a" or whatever else, because they allow for > inheritance - if a page is a member of a category, it is also a member > of all the categories that category is a member of, etc. This is a > very useful property. > > And it's not really a violation of principles, because you can think > of "category" as a third semantic relationship, one with a very > specific meaning - categories can get queried and are exported into > RDF, just like attributes and relations. > > It's true that Wikipedia uses categories for many different purposes > (more than just those 3, in fact - there are also categories like > "Articles that need more references", etc.), and many of these make > more sense as attributes and relations. However, in SMW wikis, > categories are still appropriate for one kind of semantic tagging - > "Instance of" relationships. In the example you mention, a category > like "Films" might do the job. Everything else, like language, country > of origin and genre, could be done via attributes and relations. > > -Yaron > > > On 5/26/07, Jeff Thompson <[EMAIL PROTECTED]> wrote: >> On this page: >> http://ontoworld.org/wiki/Relation:Instance_of >> it says that Relation:Instance_of and Relation:Subclass_of are >> deprecated and >> you are only allowed to use the category system. >> Maybe it was decided that average users cannot tell the >> difference between "instance of" and "subclass of", and so we are >> stuck with >> only "category". Is that why the decision was made to try to get by >> with the >> ambiguous use of "category"? >> >> For example, here is the Wikipedia category Hindi-language_films: >> http://en.wikipedia.org/wiki/Category:Hindi-language_films >> Note that this category belongs to 3 other categories in 3 very >> different senses: >> >> 1. Subclass of: "Indian_films". A specific film that is a Hindi >> language film >> is also an Indian film, so the category Hindi-language_films is a >> subclass of Indian_films. >> 2. Instance of: "Films_by_language". A specific film that is a Hindi >> language film is *not* a film by language. Rather, it is the >> category Hindi-language_films that is an instance of the higher-level >> category of Films_by_language, along with other categories like >> Tamil-language_films. >> 3. Somehow related to: "Bollywood". The category Hindi-language_films >> has >> something to do with Bollywood, but the relationship is not >> specified. >> However, isn't that the whole point of the Semantic Web, to make >> the relationships >> explicit? But the category system is as generic as an untagged >> link in >> Web 1.0 that we are trying to fix with Web 3.0. >> >> Is there a web page or statement about how the Semantic Mediawiki will >> handle these 3 different types of relations, if the more meaningful >> relations are deprecated and we are only allowed to use the category >> system? >> Is it a totally closed issue? >> >> Thanks for any help, >> - Jeff >> >> >> ------------------------------------------------------------------------- >> This SF.net email is sponsored by DB2 Express >> Download DB2 Express C - the FREE version of DB2 express and take >> control of your XML. No limits. Just data. Click to get it now. >> http://sourceforge.net/powerbar/db2/ >> _______________________________________________ >> Semediawiki-user mailing list >> Semediawiki-user@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/semediawiki-user >> > > > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Semediawiki-user mailing list Semediawiki-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/semediawiki-user
