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This document defines an API which standardizes the methods for diagnosing HPCs and legacy ECUs, the retrieval of the diagnostic capabilities, and the discovery of the SOVD methods in an extended vehicle. The SOVD API provides a unified access to classic ECUs and HPCs. The SOVD API provides functions such as: With these features SOVD can cover all areas of the vehicle life cycle which includes in particular Engineering (Development), Manufacturing (Production), After Sales (Maintenance and Repair), Legal and Technical inspections, and Vehicle operation (Use). There are several aspects which are not covered by this document, as they are specific to the implementation of an SOVD server, for example: This document considers the extended vehicle as defined in ISO20077 series. This means that the API or its elements can be inside or outside the physical vehicle.