It is the LRMI group lead by Creative Commons and the AEP that is building and managing the extension of this learning resource section of the Schema.org tree. The process can be followed on the google group for LRMI. At this point, it is not expressing a controlled vocabulary, but rather a tag type classification similar to LOM, but simpler and focused on real use cases relating to search and discovery.
The actual vocabularies will be the responsibility of the content publisher, but suggested or default vocabularies are likely. Much to come, and the use case form I provided previously is needed to capture your requirements.
> Bing, Google, Yahoo are intending to develop a given set of controlled
> vocabularies for many topic areas that will be their primary means of
> crawling and identifying and surfacing resources. There is a concern
> that the vocabularies that are selected will create obscurity for
> those repositories that find their vocabularies inconsistent with
> schema.org's.
> The collective Big 3 task force has assured all that there wil be a
> process by which modifications, amendments, and additions can be made
> over time, particularly when use-data shows popularity or traction for
> competing vocabulary items or new ones all together from the
> field...for instance if NASA finds an additional planet.
> However, there was concern that when these 3 agents effectively adopt
> an initial, albeit, open to modification, vocabulary...with the basis
> of credible use and traction of a competing taxonomy as the impetus
> for that change, is likely to not occur when the "3 big directors of
> the main interstates" direct almost all traffic to the existing
> resources based on the adopted or endorsed vocabularies. Seems like
> structuring congruently to these endorsed vocabularies on some level
> will aid in internal search and discovery and provide some initial
> push for common data and meta-data documentation of learning objects
> across collections.
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