What are the two obligatory elements in a SOAP fault message?

In a SOAP fault message, the two mandatory elements are FaultCode and FaultString. These elements are essential for the proper interpretation of the error condition that has occurred during the processing of a SOAP message.

The FaultCode element provides a specific code that indicates the type of error encountered. It categorizes the fault and helps the receiving application understand what went wrong. The FaultString element contains a human-readable description of the fault, offering more detail regarding the nature of the error. This description is crucial for developers and users to diagnose issues effectively.

Through these two elements, SOAP fault messages ensure that errors are communicated clearly and can be processed accordingly by the receiving system, facilitating troubleshooting and fixing issues in SOAP-based web services.