Currently INSPIRE uses a version of MARC as a schema to organize information in records. In the next version of INSPIRE, we will instead use a JSON schema. Below is a link to a full dictionary of the JSON schema, including references to how it is related to current MARC fields.
https://inspire-schemas.readthedocs.io/en/latest/schemas/index.html
Under the Records heading you’ll find links to the JSON fields used in records from each INSPIRE collection (HEP, Authors, Institutions, etc.).