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Help talk:Class

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This article (Class) needs attention because:
I believe the DM-level relations, specifically classes, hyponymy and meronymy, need a lot of attention and probably have to be reorganized as they are not clearly defined and seperated. For example, sometimes classes are used to describe a "is instance of" relationship and sometimes they are used for "is a type of" relationships. See User:Dh#Relations (especially User:Dh#Misc) for a first attempt. Also, it seems neccessary to implement "multi-level" inheritance for classes (right now we only have a "one-level" inheritance of properties) as well as hyponmy relations, though I am aware that this requires a non-trivial change of software. --dh 11:32, 19 January 2010 (UTC)
It has been added to this category for attention. Thank you for your patience.


Also, unless I misunderstand "hyponomy", the given example is not correct: Belgium is not a hyponym (narrower term) of country but an instance of it. Maybe it is confusing to use "is a" to describe the relationship. For example, the statements "Glenn Gould is a musician" and "musician is a(n) artist" are both true, but they both describe different relationships. Clearer would be to say "Glenn Gould is an instance of pianist" and "pianist is a type of musician". As I mentioned above, right now this distinction is not made and both types of relationships are represented by "class membership". IMO we should use "class membership" only for instances and the hyponomy/holonymy relationship to indicate subclass relationships (is a type of). --dh 21:05, 21 January 2010 (UTC)

Yes it is an instance, and yes, the "is a" is misleading. I am correcting the introduction. --Kipcool 22:19, 21 January 2010 (UTC)