Relaxing the Value of owl:deprecated

Hi!

In a sense, this is a sort of implementation feedback. 

When I thought about deprecation of a term last night, it came to mind that, in general, writing something like

  ex:oldIRI owl:deprecated "as of version 1.23" .

would be nice to have sometimes (as in Javadoc). But we basically seem to restrict our new deprecation annotation property to values being the literal "true"^^xsd:boolean. Looks like a missed chance to me.

Looking closer, this restriction does not seem to be all too deep in our spec. The reverse RDF mapping maps owl:Deprecated(Class|Property) to owl:deprecated "true"^^xsd:boolean, but elsewhere, the only other relevant place that I found which talks about "true"^^boolean is in Section 5.5 of the Structural Spec:

[[
   An annotation with the owl:deprecated annotation property 
-> and the value equal to "true"^^xsd:boolean 
   can be used to specify that an IRI is deprecated.
]]

So my question: Provided that there are no technical issues that I missed, why not simply remove this restriction (the middle part of the cited sentence above)? After all, owl:deprecated is an annotation property, so it should be fine to use it with whatever value people think is best suited for their needs? 

Btw, in the RDF-Based Semantics, the rdfs:range of owl:deprecated is defined as rdfs:Resource, so it's unrestricted, but there is an informative note that one should better only use it with "true"^^boolean in compliance with the rest of the spec. In case of a change, I would then adjust this passage as well.

Cheers,
Michael

--
Dipl.-Inform. Michael Schneider
Research Scientist, Dept. Information Process Engineering (IPE)
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Email: michael.schneider@fzi.de
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