Thanks for the reply.
I understood the purpose of these tags.
Will the error is a user friendly error (like Name field cannot be left blank)
or developer friendly error (like Name cannot be null).
Also what the expected errors in each APIs.
Because I may want to display my own message on faliure.
Based on a field is null, or duplicate value, or minumum 5 character etc.
Unless we know what are the poossible errors throw how do we handle the failure conditions?
Please throw some light. Thanks again.