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doc:measurement_units [2013/04/22 09:30] – created admindoc:measurement_units [2014/06/05 11:38] – external edit 127.0.0.1
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 ====== Representing units of measure ====== ====== Representing units of measure ======
 ~~NOTOC~~ ~~NOTOC~~
-This module provides functionality to describe and reason about units of measure attached to numerical values. Transparent conversion between compatible units (e.g. lengths, time intervals, etc) is provided as well as explicit conversion methods. Full backwards compatibility is ensured by treating values without units as being in the respective SI base units (which, by convention, was used so far). It is based on a large, standard [http://qudt.org/ measurement units ontology] by NASA.+This module provides functionality to describe and reason about units of measure attached to numerical values. Transparent conversion between compatible units (e.g. lengths, time intervals, etc) is provided as well as explicit conversion methods. Full backwards compatibility is ensured by treating values without units as being in the respective SI base units (which, by convention, was used so far). It is based on a large, standard [[http://qudt.org/|QUDT measurement units ontology]] by NASA.
  
 ===== Functionality ===== ===== Functionality =====
   * Values can be annotated with their units as RDF data types   * Values can be annotated with their units as RDF data types
-  * The definitions of units, quantities etc are imported from the large [http://qudt.org/ QUDT ontology]+  * The definitions of units, quantities etc are imported from the large [[http://qudt.org/|QUDT ontology]]
   * The units can be converted into each other using the convert_to_unit(Input, OutputType, Res) predicate   * The units can be converted into each other using the convert_to_unit(Input, OutputType, Res) predicate
   * Transparent conversion is done by an rdf_triple hook definition that accepts queries for values in a given unit like rdf_triple(knowrob:length, 'test-inst', literal(type(unit:'Kilometer', Val))). If results in a different unit are found, they are converted transparently and returned in the correct format.   * Transparent conversion is done by an rdf_triple hook definition that accepts queries for values in a given unit like rdf_triple(knowrob:length, 'test-inst', literal(type(unit:'Kilometer', Val))). If results in a different unit are found, they are converted transparently and returned in the correct format.