- From: Monika Solanki <monika@dmu.ac.uk>
- Date: Sun, 15 Jun 2003 12:41:03 +0100
- To: "Roger L. Costello" <costello@mitre.org>
- CC: www-rdf-interest@w3.org, www-ws@w3.org
- Message-ID: <3EEC5B4F.4040500@dmu.ac.uk>
Hi, I was wondering if it would be an idea to introduce, Arithematic and Logical operators as relationships between properties? Is some work going on in this direction?. I know about some work on predicate calculus that has been done at Yale university. however, I have not come across anything with respect to Arithematic operators. -Monika Roger L. Costello wrote: >Monika Solanki wrote: > >>Hi Roger, >> >>I am facing a similar problem to yours. I have a class A, which has >>two properties P1 and P2. I want to state that P2= P1-1. Incidentally >>I could not find anyways in OWL to express this. Is there some >>cnstruct in OWL to state this? >> > >The problem you state is identical to the problem that I am raising. >Hopefully with some discussion we can come to a good solution. /Roger > >>Roger L. Costello wrote: >> >>>Hi Folks, >>>Yesterday I sent out a message asking about technologies to express >>>mathematical relationships. Robin Berjon responded with a very >>>interesting idea. I would like to get your thoughts on it, and see >>>if >>>collectively we can come up with something cool. >>>First I will show you a slightly modified version of Robin's >>>proposal, >>>then I will show Robin's original proposal. >>>Robin's Idea Slightly Modified >>>The idea is to extend OWL and base the solution on xPath. >>>Suppose that I would like to state that these two properties are >>>equivalent via a conversion factor: >>> length-in, length-cm >>>i.e., length in inches, and length in centimeters >>>The conversion factor is: >>> length-in = length-cm / 2.54 >>> length-cm = length-in * 2.54 >>>With today's OWL here is how you would define these properties: >>> <owl:DatatypeProperty rdf:ID="length-in"> >>> <rdfs:range rdf: >>>resourse="&xsd;decimal"/> >>> </owl:DatatypeProperty> >>> <owl:DatatypeProperty rdf:ID="length-cm"> >>> <rdfs:range rdf:resourse="&xsd;decimal"/> >>> </owl:DatatypeProperty> >>>The proposal is to extend OWL to allow you to assert that these two >>>properties are equivalent by the above conversion factor. Here's >>>how it >>>might look: >>> <owl:DatatypeProperty rdf:ID="length-in"> >>> <owl:equivalentProperty rdf:resource="#length-cm" >>> owl-x:conversionFactor="current() * 2.54"/> >>> <rdfs:range rdf:resourse="&xsd;decimal"/> >>> </owl:DatatypeProperty> >>> <owl:DatatypeProperty rdf:ID="length-cm"> >>> <owl:equivalentProperty rdf:resource="#length-in" >>> owl-x:conversionFactor="current() / 2.54"/> >>> <rdfs:range rdf:resourse="&xsd;decimal"/> >>> </owl:DatatypeProperty> >>>where: >>> >>> owl-x is an OWL eXtension namespace, >>> current() is the xPath function referring to the current node. >>>Now let me show you Robin's idea: >>>Robin's idea is also to base the solution on xPath. Here's what >>>Robin >>>said: >>>"For instance: >>><foo:PropertyEquivalence from='measure:inch' >>> to='measure:cm' >>> convert='$in_1 * 2.54'/> >>><foo:PropertyEquivalence from='measure:cm' >>> to='measure:in' >>> convert='$in_1 div 2.54'/> >>>would allow you to declare that the following are equivalent: >>><geo:Distance> >>> <measure:inch>2</measure:inch> >>></geo:Distance> >>><geo:Distance> >>> <measure:cm>5.08</measure:cm> >>></geo:Distance> >>>You could allow for multiple inputs to your binding: >>><foo:PropertyEquivalence >>> from='size:width/measure:meter< >>>br>size:length/measure:meter' >>> to='size:surface/measure:squareMeter' >>> convert='$in_1 * $in_2'/> >>>and perhaps equivalentize, depending on whether it makes sense in >>>that >>>context: >>><flat:Bedroom> >>> <size:width><measure:meter>4</measure:meter></size:width> >>> <size:length><measure:meter>5</measure:meter></size:length> >>></flat:Bedroom> >>><flat:Bedroom> >>> <size:surface> >>> <measure:squareMeter>20</measure:squareMeter> >>> </size:surface> >>></flat:Bedroom> >>>so that given the first you could still query for flat:Bedrooms that >>>are larger than 20sqm. >>>You may need to throw in stuff from EXSLT Math if you want more than >>>XPath provides." >>>.... >>>Okay, those are the two ideas thus far. What do you think? Feel >>>free >>>to add your own ideas. If this whole approach is bad, feel free >>>to say >>>so. The intent here is to brainstorm. If these conversion rules are >>>better stated using another technology (e.g., RuleML) please say so. >>>/Roger >>> >>-- >> >>>**<>**<>**<>**<>**<>**<>**<>**<>**<>**< >>> >>Monika Solanki >>De Montfort University >>Software Technology Research Laboratory >>Hawthorn building, H00.18 >>The Gateway. >>Leicester LE1 9BH, UK >> >>phone: +44 (0)116 250 6170 intern: 6170 >>email: monika@dmu.ac.uk >>web: http://www.cse.dmu.ac.uk/~monika/ >> >>>**<>**<>**<>**<>**<>**<>**<>**<>**<>**< >>> >>"NOTE: The information transmitted is intended only for the person or >>entity to which it is addressed and may contain confidential and/or >>privileged material. Any review, retransmission, dissemination or >>other use of, or taking of any action in reliance upon this >>information by persons or entities other than the intended recipient >>is prohibited. If you received this in error, please contact the >>sender and delete the material from any computer" >> > -- >**<>**<>**<>**<>**<>**<>**<>**<>**<>**< Monika Solanki De Montfort University Software Technology Research Laboratory Hawthorn building, H00.18 The Gateway. Leicester LE1 9BH, UK phone: +44 (0)116 250 6170 intern: 6170 email: monika@dmu.ac.uk <mailto:monika@dmu.ac.uk> web: http://www.cse.dmu.ac.uk/~monika/ <http://www.cse.dmu.ac.uk/%7Emonika/> >**<>**<>**<>**<>**<>**<>**<>**<>**<>**< "NOTE: The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer"
Received on Sunday, 15 June 2003 07:35:26 UTC