Partly. Authorea does not currently use RDF, OWL, JSON LD, or other Linked Data and semantic web languages to describe its contents. It embraces standard JATSXML for scholarly content and an accessible, shared, open (but not formal) YAML for data and other materials.

I2: (Meta)data use vocabularies that follow the FAIR principles

Partly. The JATSXML schema used by scholarly resources on Authorea is documented (http://www.w3.org/2001/XMLSchema-instance), but the YAML file used for data, while simple, is not.

I3: (Meta)data include qualified references to other (meta)data

Not applicable / not at the moment. A qualified reference is possible but not applicable or applied in any of the current schemas or datasets.