typedef int PK_ERROR_severity_t; This datatype describes the severity of an error returned from a PK function call. One of the following values: PK_ERROR_none No error. PK_ERROR_mild Mild error. PK_ERROR_serious Serious error. PK_ERROR_fatal Fatal error. For more information about error severity, and the appropriate action to take after each type of error, see Ch 57, Error Handling, in the Parasolid Functional Description.