Well, validators developers will not be very happy with this change.
However, if it happens, I prefer 'type' name, because 'additionalType' implies there are other, non-additional ones.
And on semantic level there must be no difference between object types.
19.06.2012, 22:37, "Martin Hepp" <martin.hepp@ebusiness-unibw.org>:

Hi Dan,
Thanks for summarizing this. Two suggestions:

1. Instead of samePropertyAs: rdf:type, use owl:equivalentProperty if you want to express how the additional type information can be mapped into an RDF world.

2. Add a link to the thread in the W3C archive so that the full details of the discussions are easy to reach:

By the way, the original proposal now being favored was already described in my post


and presented at the schema.org Workshop back in September 2011 (slide 16):




On Jun 19, 2012, at 7:24 PM, Dan Brickley wrote:

Thanks everyone. Lots of mail!

I have tried to make a brief summary of some of the points in the Web
Schemas wiki, just a sketch of individual positions really rather than
a summary of the whole debate. I also started there to write up
details of a concrete proposal for 'additionalType'.

http://www.w3.org/wiki/WebSchemas/additionalTypeProposal ...

Since nobody has volunteered to lead an effort to get Microdata syntax
changed to support multiple types from different vocabularies, and on
balance after reading thru all the debate, I think we should go for
the new property approach.

I'd like to make sure that we capture all the concerns people have in
the Wiki and in the resulting property definition, and to give some
thought to how validators and checkers ought to behave.

Peter, Egor, others, ... can you live with a new property here? (one
of 'additionalType' or 'type') Any preferences on name?



martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

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