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RE: How to restrict the possible values of a class?

From: McBride, Brian <bwm@hplb.hpl.hp.com>
Date: Tue, 27 Jun 2000 12:15:02 +0100
Message-ID: <5E13A1874524D411A876006008CD059F2392A5@0-mail-1.hpl.hp.com>
To: www-rdf-interest@w3.org
I'm not sure that I think its very pretty, but could
you make DayRange a subclass of Range?

Brian McBride
HPLabs


>-----Original Message-----
>From: Tom Van Eetvelde [mailto:tom.van_eetvelde@alcatel.be]
>Sent: Tuesday, June 27, 2000 11:27
>To: www-rdf-interest@w3.org
>Subject: How to restrict the possible values of a class?
>
>
>Hello RDF community,
>
>I have the following practical problem: how can I restrict 
>classes/properties to certain values? I
>ran into this problem with the creation of a Date class:
>
><rdfs:Class rdf:ID="Range">
>  <rdfs:Label> Range </rdfs:Label>
>  <rdfs:comment>
>    This class represents an interval.
>  </rdfs:comment>
>  <rdfs:subClassOf rdf:resource="#CompositeValue"/>
></rdfs:Class>
>
><rdfs:Property rdf:ID="gr">
>  <rdfs:label> gr </rdfs:label>
>  <rdfs:comment>
>    The 'GReater than' property. Defines a lower boundary of the range.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Range"/>
></rdfs:Property>
>
><rdfs:Property rdf:ID="ge">
>  <rdfs:label> ge </rdfs:label>
>  <rdfs:comment>
>    The 'Greater than or Equals' property. Defines a lower 
>boundary of the range.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Range"/>
></rdfs:Property>
>
><rdfs:Property rdf:ID="ls">
>  <rdfs:label> ls </rdfs:label>
>  <rdfs:comment>
>    The 'LeSs than' property. Defines an upper boundary of the range.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Range"/>
></rdfs:Property>
>
><rdfs:Property rdf:ID="le">
>  <rdfs:label> le </rdfs:label>
>  <rdfs:comment>
>    The 'Less than or Equals' property. Defines an upper 
>boundary of the range.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Range"/>
></rdfs:Property>
>
><rdfs:Class rdf:ID="Date">
>  <rdfs:Label> Date </rdfs:Label>
>  <rdfs:comment>
>    This class represents a date in the format DD/MM/YYYY 
>(day-month-year).
>  </rdfs:comment>
>  <rdfs:subClassOf rdf:resource="#CompositeValue"/>
></rdfs:Class>
>
><rdfs:Property rdf:ID="day">
>  <rdfs:label> day </rdfs:label>
>  <rdfs:comment>
>    The day part of the date.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Date"/>
>  <rdfs:range rdf:resource="#DayRange"/>
></rdfs:Property>
>
><rdfs:Property rdf:ID="month">
>  <rdfs:label> month </rdfs:label>
>  <rdfs:comment>
>    The month part of the date.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Date"/>
>  <rdfs:range rdf:resource="#MonthRange"/>
></rdfs:Property>
>
><rdfs:Property rdf:ID="year">
>  <rdfs:label> year </rdfs:label>
>  <rdfs:comment>
>    The year part of the date.
>  </rdfs:comment>
>  <rdfs:domain rdf:resource="#Date"/>
>  <rdfs:range rdf:resource="#YearRange"/>
></rdfs:Property>
>
>The RDF Shema Spec literally says that 'domain' and 'range' 
>may only have values of the type
>'class'. I wanted to make DayRange an instance of the Range 
>class with properties ge = 1 and le =
>31. But clearly, the Spec forbids this as I would have a value 
>type of Range <> Class. So, how can I
>indicate that the Dayrange runs from 1 to 31 (similar question 
>for month and year)?
>
>Regards,
>
>Tom.
>
Received on Tuesday, 27 June 2000 07:15:12 GMT

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