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Re: Extending daml+oil with concrete datatypes

From: Ian Horrocks <horrocks@cs.man.ac.uk>
Date: Mon, 22 Jan 2001 18:53:54 +0000 (GMT)
Message-ID: <14956.33218.417775.139336@excalibur.cs.man.ac.uk>
To: Mike Dean <mdean@bbn.com>
Cc: www-rdf-logic@w3.org
On January 22, Mike Dean writes:
> Ian,
> 
> Thanks for sending this out!
> 
> Here are a few initial comments:
> 
> 1) I found it interesting that you included xsd:simpleType
> definitions within the rdf:RDF in [1].  This breaks RDF API
> and probably other existing RDF/DAML tools.  I had expected
> that the XML Schema datatypes would be defined at a separate
> .xsd URI and referenced from daml+oil+concrete-ex.daml.

Oops. We were trying to keep things simple and obviously overdid
it. Would it be OK for now if I just moved the type definitions
outside the scope of the <rdf:RDF></rdf:RDF>?

> 2) There are several XML well-formedness problems in
> daml+oil+concrete-ex.daml.  See diffs below.  In particular,
> rdfs:range for concrete types needs an attribute name as
> well as a value.

Fixed, thanks. I used "rdf:resource" as the attribute - presumably RDF
will not object to my treating XMLS type definitions as resources.

> 3) You say
> 
> > Non-supported data types can either be trapped as an error
> > or ignored.
> 
> They can also be treated as rdfs:Literal.

The trouble is that a daml agent may have no idea what data types are
supported or even if what it has are syntactically correct
definitions/values - it can just pass sets of type definitions and
values to a "validator" and expect only yes/no answers.

Ian

> 
> Thanks!
> 
> 	Mike
> 
> [1] http://www.cs.man.ac.uk/~horrocks/DAML+OIL/Datatypes/daml+oil+concrete-ex.daml
> 
> C:\temp>e:\cygwin\bin\diff daml+oil+concrete-ex-orig.daml daml+oil+concrete-ex.daml
> 23,24c23,25
> <   <xsd:minInclusive value="13"/>
> < </xsd:restriction>
> ---
> >     <xsd:minInclusive value="13"/>
> >   </xsd:restriction>
> > </xsd:simpleType>
> 30,31c31,33
> <   <xsd:minInclusive value="18"/>
> < </xsd:restriction>
> ---
> >     <xsd:minInclusive value="18"/>
> >   </xsd:restriction>
> > </xsd:simpleType>
> 37,38c39,41
> <   <xsd:minInclusive value="60"/>
> < </xsd:restriction>
> ---
> >     <xsd:minInclusive value="60"/>
> >   </xsd:restriction>
> > </xsd:simpleType>
> 45c48
> <        <xsd:restriction base='integer'>
> ---
> >        <xsd:restriction base='integer'/>
> 48c51
> <        <xsd:restriction base='string'>
> ---
> >        <xsd:restriction base='string'/>
> 59c62
> <   <rdfs:range "xsd:decimal"/>
> ---
> >   <rdfs:range something="xsd:decimal"/>
> 68c71
> <   <rdfs:range "xsd:nonNegativeInteger"/>
> ---
> >   <rdfs:range something="xsd:nonNegativeInteger"/>
> 75c78
> <   <rdfs:range "clothingsize"/>
> ---
> >   <rdfs:range something="clothingsize"/>
> 206c209
> < </daml:Property>
> ---
> > </daml:ConcreteProperty>
Received on Monday, 22 January 2001 13:59:50 GMT

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