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createStudentAccount(ident username, ident studentId, string lastName, string firstName, string email, string password) { assume not exists //accounts/account[username]; assume count(studentId, //accounts/account/student/id) = 0; insert //accounts <account username=[username] lastName=[lastName] firstName=[firstName] email=[email] password=[password] > <student id=[studentId] /> </account> } # roles: guest