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w3c / wot-thing-description

Web of Things (WoT) Thing Description
http://w3c.github.io/wot-thing-description/
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Property extending DataSchema #338

Closed danielpeintner closed 5 years ago

danielpeintner commented 5 years ago

The TD spec states in Section 5.3.2 Property that

Property instances are also instances of the class DataSchema.

Looking at the Information Model and Figure 1 this seems not to be the case. The automatically generated figure does not show any relation.

@vcharpenay is this missing in the ontology?

vcharpenay commented 5 years ago

There was a debate in TD telcos about this and no decision was taken, hence no relation in the ontology. @mariapoveda, @maximelefrancois86, how to deal with this issue?

At some point, there was the idea that properties differentiate from actions' input/output insofar that they represented schema instances. This view is not relevant anymore, after the discussion of #259 in which we established that an alignment ssn:Property ~ td:Property was not a good choice. Today, I think we can add td:Property < schema:DataSchema, maybe in a separate file.

mariapoveda commented 5 years ago

In my opinion the ontology does not need to include td:Property < schema:DataSchema in order to allow property instances to be also DataSchema instances, it is enough not making such classes disjoint.

The td:Property < schema:DataSchema could be added in a separate file as extension rather than part of the model.

sebastiankb commented 5 years ago

Still, there is a arrow missing between property and DataSchema.

here is a similar issue about this https://github.com/w3c/wot-thing-description/issues/495 . we should wait until this issue is clarified.

vcharpenay commented 5 years ago

see #509.