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dbpedia / mappings-tracker

This project is used for tracking mapping issues in mappings.dbpedia.org
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what are "super" datatypes? #22

Open VladimirAlexiev opened 9 years ago

VladimirAlexiev commented 9 years ago

http://mappings.dbpedia.org/index.php/DBpedia_Datatypes shows a "hierarchy" of datatypes. But there's no such thing as subClassOf for datatypes. Therefore datatypes like http://mappings.dbpedia.org/index.php/Datatype:Area should be explained, because they can cause confusion. If not needed, they should be removed (and just kept as headings)

Would be nice to update this (edited 2010-2011)

VladimirAlexiev commented 9 years ago

I updated against the list of datatatypes and added .headings and TOC. If "super types" are used somehow by the "unit" mapping field (eg unit=electricCurrent), they should stay.

VladimirAlexiev commented 9 years ago

Could someone check the intro text on http://mappings.dbpedia.org/index.php/DBpedia_Datatypes and close this? @jimkont or @anjeve ?

IS4Code commented 3 years ago

There is a subClassOf for datatypes. In RDFS, an instance of rdfs:Datatype is also a rdfs:Class, which is why you can use it with rdfs:range. The class interpretation of a datatype is simply its value space.

That being said, I am not sure whether "abstract" classes like length, area, mass etc. qualify as datatypes. On one hand, each one of them is definitely a subclass of rdfs:Literal like a datatype, but they don't have any lexical space, and something like "10cm"^^:length defeats the whole purpose of having individual units. Things like owl:real are however treated as datatypes.