Date: May 10, 2007 1:09:21 PM EDT
Subject: Re: [office-metadata] RDF datatypes
I think Elias and Svante have this right now. I think the idea of generating additional blank nodes was just a thought experiment, and it clarified the issues.
One thing Svante. I want to make sure the following would be allowed:
[1] <ex:foo about="ex:solarSystem" property="numberOfPlanets" m:data-type="xsd:integer">9</ex:foo>
just as it would be allowed, but not be *required* to have:
[2] <ex:foo about="ex:solarSystem" property="numberOfPlanets" m:data-type="xsd:integer" m:data-value="9">9</ex:foo>
or
[3] <ex:foo about="ex:solarSystem" property="numberOfPlanets" m:data-type="xsd:integer" m:data-value="9">nine</ex:foo>
In other words, m:data-value is not *required*, and can be sensibly omitted if the string content child of the element in the DOM is a literal with a typed value in the domain of the datatype.
And in this case:
[4] <ex:foo about="ex:solarSystem" property="numberOfPlanets" m:data-type="xsd:integer">baloney sandwich</ex:foo>
then we have some kind of error condition that we deal with in some way (yet to be defined)--probably similar to the way we would deal with:
[5] <ex:foo about="ex:solarSystem" property="numberOfPlanets" m:data-type="xsd:integer" m:data-value="baloney sandwich">9</ex:foo>
John
On May 10, 2007, at 12:02 PM, Svante Schubert wrote:
Bruce D'Arcus wrote:
On May 10, 2007, at 11:36 AM, John Madden wrote:
What this means for us is, that the meaning of m:datatype is NOT that it generates any new triples, but rather that is restricts the value space of the interpretation of the typed literal to which it applies in accordance with
http://www.w3.org/TR/rdf-mt/#dtype_interp .
Right, and Svante's reading of this wrong. Data-types are defined by URIs, but they are NOT properties.
Bruce, you misjudge me, I asked for triples not stated types to be properties.
Anyway, what is important with Elias help we are about to fix the problem in the spec. Patrick and I are currently tweaking on the final wording.
Basically whenever an m:about / m:property is used in conjunction with m:data-value and m:data-type,
the RDF object is not the element content, but the value of the m:data-value attribute.
The element content becomes the RDF object of the rdfs:label from the m:about.
The m:data-type is referring as data type to the value of m:data-value.
Svante