Error code (e.g., "E001", "W001")
OptionalcolumnColumn number where the error occurred (1-based)
OptionalendEnd Unicode character offset of the error range (exclusive)
OptionallineLine number where the error occurred (1-based)
The error/warning message
Severity of the validation issue
OptionalstartStart Unicode character offset of the error range (not UTF-16 code units)
A single validation error or warning.