Terms and abbreviations Term/Abbreviation Description API Application Programming Interface BO Batch Operation CSV Comma-separated values ECCAIRS European Co-ordination Centre for Aircraft Incident Reporting Systems E2 ECCAIRS 2 ECR European Central Repository ERCS European Risk Classification Scheme M2M Machine-to-Machine, automated exchange of data between systems without human intervention OC Occurrence OR Original Report PDF Portable Document Format SR Safety Recommendation VR Validated Report WT Word Template XLS Excel Spreadsheet XML Extensible Markup Language XSD XML Schema Definition For each entity or attribute in the taxonomy, you can find its definition with detailed information, an explanation, and possible values in the Taxonomy Browser.