How to limit device usage on Android Market (new feature)?

Market has added device compatibility check.Now we can check if an app will work on specific device, for exaple HTC mobile phone, Samsung Galax开发者_如何学编程y, etc.

What about developer's side: How can we build apps for specific devices only or restrict app for tablets only? How to do restriction in XML and code? It's probably some attribute in Manifest file.

Thanks

---

Here "Specifying Your Application's System API Requirements" ?

---

It seems that Market checks this out by itself.