Define a schema for the final version 2 REST services
Currently no schemas exist on the developer release of the Xero REST services. Many languages provide useful tools for XML serialization that require a schema. Providing a schema will allow developers to integrate with Xero quickly, as well as ensure that the data format is consistent.

We have been supporting and maintaining a schema for a while now: https://github.com/XeroAPI/XeroAPI-Schemas
Please check the readme for some usage warnings.
We will communicate any change to our schema project support via a developer update: http://blog.xero.com/subscribe-to-the-xero-api-developer-mailing-list/
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We are starting to develop xsd schemas for api.xero.com. They're available on github (https://github.com/xeroapi/) for you to download. At the moment, we can't promise to keep them up to date, or that they are 100% accurate, but they are a starting point for you to use.
If you want us to maintain these schema a little better, keep voting on this issue. Your votes DO count.