Revision as of 13:00, 19 January 2015

DBpedia defines datatypes for units and dimensions.

The page below shows a "hierarchy" of datatypes, although there's no such thing as subClassOf for datatypes (see #22). In PropertyMapping.unit you can specify:

Either a super-datatype, in which case the templateProperty is expected to have an explicit unit. Eg in [Mapping_pt:Info/Futebolista]:

Property Mapping (help)
template property	altura
ontology property	height
unit	Length

Or a specific datatype, in which case the templateProperty carries a pure number, which is interpreted as the provided unit. Eg in [Mapping_en:Infobox_street]:

Property Mapping (help)
template property	length_ft
ontology property	length
unit	foot

In both cases:

The number is converted to SI units (eg meters for Length)
In some cases, a specific property with a more appropriate unit is also created. Eg http://dbpedia.org/ontology/Person/height is in centimeters

XML Schema Datatypes

Area

Currency

Density

Energy

FlowRate

Force

FuelEfficiency

Datatype:kilometresPerLitre

Frequency

InformationUnit

Length

LinearMassDensity

Datatype:gramPerKilometre

Mass

PopulationDensity

Datatype:inhabitantsPerSquareMile
Datatype:inhabitantsPerSquareKilometre
Datatype:peoplePerSquareKilometer: duplicate, should be deleted

Power

Datatype:brakeHorsepower, see en.wikipedia. This is like horsepower but of an engine stripped from auxiliary components, so as to maximize the measurement.
Datatype:pferdestaerke, see de.wikipedia. I think should be merged with horsepower
Datatype:horsepower, see en.wikipedia
Datatype:gigawatt
Datatype:megawatt
Datatype:milliwatt
Datatype:kilowatt
Datatype:watt

ElectricCurrent

Voltage

Pressure

Speed

Temperature

Time

Torque

Volume

Other

Datatype:pH

Unknown

I think should be deleted

@@ Line 3: / Line 3: @@
 The page below shows a "hierarchy" of datatypes, although there's no such thing as subClassOf for datatypes (see [https://github.com/dbpedia/mappings-tracker/issues/22 #22]). In [[Template:PropertyMapping|PropertyMapping]].unit you can specify:
 * Either a super-datatype, in which case the templateProperty is expected to have an explicit unit. Eg in [Mapping_pt:Info/Futebolista]:
-      {{PropertyMapping | templateProperty = altura | ontologyProperty = height | unit = Length }}
+        {{PropertyMapping | templateProperty = altura | ontologyProperty = height | unit = Length }}
 * Or a specific datatype, in which case the templateProperty carries a pure number, which is interpreted as the provided unit. Eg in [Mapping_en:Infobox_street]:
-      {{PropertyMapping | templateProperty = length_ft | ontologyProperty = length | unit = foot}}
+        {{PropertyMapping | templateProperty = length_ft | ontologyProperty = length | unit = foot}}
 In both cases:

DBpedia Datatypes: Difference between revisions