In recent years, the aviation community in Europe decided to focus reporting on the mandatory data fields defined in EU Legislation, extended with a set of so-called essential data fields. This set of data fields is smaller that that of the full taxonomy, and is known as the Reduced Interface Taxonomy (RIT). The RIT contains currently a little over 280 data fields.
To support the provision of data based on RIT, the E5X file format was designed. The E5X format is XSD-based allowing a formal validation of the data before performing the actual submission to an authority. E5X can also be used to upload data/reports through the E2 reporting portal.