A clinic uses XML to transmit data about patients it has treated to its local hospital.
Mrs Alison Avocado (patient id 120372) had a consultation with Dr Claudio on the 20/11/2001 and then had her in-growing toenails treated on the 23/11/2001.
Miss Beatrice Beetroot (patient id 234562) had consultations with Dr Duke on the 21/11/2001 and the 23/11/2001 and with Dr Claudio on the 28/11/2001.
Data security and integrity is very important and so the clinic goes through a process of double checking the data to confirm it. At the current time the data for Mrs Avocado has been confirmed whereas the data for Miss Beetroot hasn't yet. It is important that the hospital knows which data has been confirmed and which hasn't.