The models made available are 3Docx model exports from the vendors supporting the published schema versions. The models have been used in successful exchanges between OCX consortium partners but have not independently been validated by the Consortium.
The Consortium has taken the initiative to establish an Implementer Forum with the purpose to provide validated test models to the industry, see the news article about the Implementer Forum. As the Implementer Forum is not formally established yet, the Consortium is making available some of the vendor test models. These are public models which are useful to any party seeking to implement the OCX standard and has been requested by many.
When going forward it is the plan that the Implementer Forum will maintain and publish the 3Docx validated models.