schema.org growth what are the limits?

Hello all

This is a question I has been wanting to push here for quite a while.
If my counting are correc, schema.org latest version has 428 classes + 582
properties = 1010 elements.
The number of candidate and potential extensions is likely to grow at a
steady pace. Now that a handful of early adopter industries and communities
have successfully pushed their vocabularies into schema.org, many others
are likely to follow when they discover their obvious interest in doing so.
And this when is now or quite soon, obviously.

This growth is a good thing, but it will, and actually has already hit
known limits in this kind of exercise, which once again boils down to
represent the whole world in a unique model, and a unique namespace.

The first point is not really an issue. The semantics of schema.org are
"soft" enough to accomodate slight inconsistencies between various branches
of the vocabulary, for exemple the same property used here and there with
slightly different semantics will not really be an issue if those branches
are unlikely to be used in the same context.

The unique namespace is another issue. Once a name has been used to
identify a class or a property, it can't be reused for something else. New
extensions will have to cope with the legacy. Suppose I want to use
http://schema.org/study for something else than a MedicalEntity and
MedicalStudy Suppose DDI people want to introduce their concept of Study
[1]. What will be the negotiation process?

More generally is there a limit one could set for a manageable sensible
size of the vocabulary? 10,000? 100,000?
Is there a plan of any kind to put a limit in size or in time to the
vocabulary growth?

Thanks for your thoughts.

Bernard

[1] http://rdf-vocabulary.ddialliance.org/discovery




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*Bernard Vatant
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Vocabularies & Data Engineering
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