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" ... It is worth making a critical observation about schema.org, however. It does not contain instance data. This is a really important point because there are really two different consumers of ontologies - those who are needing data models and those that are needing categorizational information within those models, i.e., data. A data model of diseases will tell you the different classes used to specify and categorize diseases, but it likely will have neither the categories nor the diseases themselves in the model. This is taxonomic and data-centric information, and it is very different from schematic information (in most cases). ... "