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imported>PeterYim |
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| = [[UoM_Ontology_Standard]] OWL - draft = | | = Uri Shani = |
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| Editor: [[RobRaskin|Rob Raskin]], [[ChipMasters|Chip Masters]] and [[HansPeter_de_Koning]]
| | Uri Shani, PhD |
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| ''... placeholder for the [[UoM_Ontology_Standard]] OWL drafting work''
| | Research Staff Member |
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| == [[SysML]] QUDV Ontology ==
| | IBM |
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| Editor: [[HansPeter_De_Koning]]
| | Haifa University, Mount Carmel |
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| The input from the [[SysML]] QUDV (Quantities, Units, Dimesions and Values) ontology in OWL2 DL can be found at http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:qudv_owl .
| | Haifa, Isreal. |
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| The ontology is split into two main modules:
| | E-mail: SHANI [at] il.ibm.com |
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| * A base ontology '''[[SysML]]-QUDV''' that defines all classes and properties
| | See: http://researcher.watson.ibm.com/researcher/view.php?person=il-SHANI |
| * The ISQ and SI individuals ontology '''[[SysML]]-QUDV-SI''' for the International System of Quantities and the International System of Units (i.e. finally should cover all of ISO/IEC 80000)
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| It would be a natural extension to add a third module that defines the most used non-SI units (with conversion factors) from [http://www.physics.nist.gov/Pubs/SP811/appenB.html SP811 "NIST Guide to the SI" Appendix B. Conversion Factors].
| | ''... Uri, at your convenience, please edit and expand on this page, and keep it updated so the community can get to know you better. Welcome! ... (read [[WikiHomePage|this]] if it's your first time editing the Ontolog wiki.) =ppy'' |
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| The main concepts (classes) in QUDV that correspond closely to VIM and that are probably also applicable to QUOMOS are:
| | [[Category:Person]] |
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| * <nowiki>[[SystemOfQuantities]]</nowiki>
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| * <nowiki>QuantityKind</nowiki> or <nowiki>[[KindOfQuantity]]</nowiki>, an abstract superclass with subclasses:
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| ** <nowiki>[[SimpleQuantityKind]]</nowiki>
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| ** <nowiki>[[DerivedQuantityKind]]</nowiki>
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| ** <nowiki>[[SpecializedQuantityKind]]</nowiki>
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| * <nowiki>Quantity</nowiki>
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| * <nowiki>Dimension</nowiki> or <nowiki>QuantityDimension</nowiki>
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| * <nowiki>[[SystemOfUnits]]</nowiki>
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| * <nowiki>Unit</nowiki> or <nowiki>[[UnitOfMeasure]]</nowiki>, an abstract superclass with subclasses:
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| ** <nowiki>SimpleUnit</nowiki>
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| ** <nowiki>DerivedUnit</nowiki>
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| ** <nowiki>[[ConversionBasedUnit]]</nowiki>, an abstract superclass with subclasses:
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| *** <nowiki>PrefixedUnit</nowiki>
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| *** <nowiki>[[LinearConversionUnit]]</nowiki>
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| *** <nowiki>[[GeneralConversionUnit]]</nowiki>
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| * <nowiki>Prefix</nowiki> or <nowiki>[[UnitOfMeasurePrefix]]</nowiki>
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| * <nowiki>Scale</nowiki>
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| === Remarks on current QUDV implementation ===
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| # In QUDV, base quantities and base units are modeled as object properties of <nowiki>[[SystemOfQuantities]]</nowiki> and <nowiki>[[SystemOfUnits]]</nowiki> (i.e. roles). We distinguish between ''simple'' and ''base'' kinds of quantity and units:
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| ## A ''simple'' kind of quantity or a ''simple'' unit does not depend (for its definition) on any other kind of quantity or unit.
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| ## A ''base kind of quantity'' is a role that is assigned to selected kinds of quantity in the context of a system of quantities.
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| ## A ''base unit'' is a role that is assigned to selected units in the context of a system of units.
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| # For the SI system of units, this separation of ''simple'' and ''base'' units e.g. cleanly solves the problem of selecting the <nowiki>PrefixedUnit</nowiki> "kilogram" as a ''base unit''. The "kilogram" is defined through object properties to the <nowiki>Prefix</nowiki> "kilo" and to the <nowiki>SimpleUnit</nowiki> "gram".
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| # QUDV contains an algorithm written in OCL that precisely specifies how a ''quantity dimension'' for a given kind of quantity in a given system of quantities can be derived automatically.
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| # In the OWL version of QUDV the <nowiki>[[AffineConversionUnit]]</nowiki> (conversion unit defined with factor and offset to a reference unit) is removed because this is better handled by a <nowiki>[[LinearConversionUnit]]</nowiki> and adding an equivalent property between scale value definitions of different scales. E.g. the offset needed to convert between a ''thermodynamic temperature'' in kelvin and a ''Celsius temperature'' in degree Celsius can be derived when the ''triple point of water'' scale value definitions in both the Kelvin and Celsius scales are declared equivalent.
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| # The <nowiki>[[SpecializedQuantityKind]]</nowiki> is modeled explicitly because QUDV complies with the strict separation into (MOF) meta levels in UML. QUDV is a pure level M0 UML or [[SysML]] <<modelLibrary>>. Accordingly in OWL2 DL it is not allowed to use metaclasses (using owl:class). This is also not supported in Protégé v4 (yet). In OWL2 Full it would perhaps be possible to model the kind of quantity / quantity specialization relationships more elegantly.
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| [[Category:WorkSpace]] [[Category:OntologBasedStandards]] [[Category:UoM_Ontology_Standard]]
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