XSD versioning ...

What is the best way to handle XSD versioning? Let's say I have the following scenario ...

- Version 1 of the XSD is given to a customer.
- The customer writes a parsing program (that performs validation against V1).

3 months later ...

- A new element is added to version 2 of the XSD.
- The new XML files sent to the customer have the new element.
- The new XML files fail validations because version 1 of the XSD does not have the new element.

Is there anything that I can do to plan for this? Thank you.

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