[Wikidata-l] qudt ontology facets

The NIST ontology defines 4 basic classes that are great: _qudt:QuantityKind [11]_, _qudt:Quantity [12]_, _qudt:QuantityValue [13]_, _qudt:Unit [14]_ but the properties set leaves me a bit thirsty. Take "Area" as an example. I'd like to reference properties named .ft2 and .m2 so that, for instance, an annotation might be [[Leasable area.ft2::12345]]. To state the precision applicable to that measurement, might be [[Leasable area.ft2:fractionDigits :: 0]] to indicate say, rounding. However, in the NIST ontology, there is no "ft2" property at all -- this is an SI unit though, so it seems identifying first the system of measurement units, and then the specific measurement unit is not a great idea because these notations are then divorced from the property name itself, a scenario guaranteed to cause more user errors & omissions I think. Someone's mentioned uncertainty facets, so I suggest these from the qudt ontology: Property: .anyType:relativeStandardUncertainty Property: .anyType:standardUncertainty Other facets noted might include Property: .anyType:abbreviation Property: .anyType:description Property: .anyType:symbol -john On 19.12.2012 08:10, Herman Bruyninckx wrote: Martynas, could you please let me know where RDF or any of the W3C standards covers topics like units, uncertainty, and their conversion. I would be very much interested in that. in OWL: "QUDT - Quantities, Units, Dimensions and Data Types in OWL and XML": share Martynas' concerns: most of the problems that are being discussed in this thread (and that are very relevant and interesting) should not be solved with an "object oriented" approach (that is, via properties of objects, and "inheritance") but by semantic modelling (that base on who context are the "Topic Map" opinion: Denny 16 328056 Vice-President Research euRobotics <http://www.eu-robotics.net [7]> Open RObot COntrol Software <http://www.orocos.org [8]> Associate Editor JOSER <http://www.joser.org [9]>, IJRR <http://www.ijrr.org [10] mailing list > Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l [1] Links: ------ [1] https://lists.wikimedia.org/mailman/listinfo/wikidata-l [2] http://www.mail-archive.com/wikidata-l@lists.wikimedia.org/msg00056.html [3] http://www.mail-archive.com/wikidata-l@lists.wikimedia.org/msg00750.html [4] http://wikimedia.de [5] http://www.qudt.org/qudt/owl/1.0.0/index.html [6] http://en.wikipedia.org/wiki/Topic_map [7] http://www.eu-robotics.net [8] http://www.orocos.org [9] http://www.joser.org [10] http://www.ijrr.org [11] http://www.qudt.org/qudt/owl/1.0.0/qudt/index.html#QuantityKind [12] http://www.qudt.org/qudt/owl/1.0.0/qudt/index.html#Quantity [13] http://www.qudt.org/qudt/owl/1.0.0/qudt/index.html#QuantityValue [14] http://www.qudt.org/qudt/owl/1.0.0/qudt/index.html#Unit