Eclipse allows you to "validate" a project. It returns a dialogue such as: "Validate completed with 5 warnings, 35 resources were validated in under 1 second". But I can't find the console that shows those warnings. Is that validation even meaningful for MonkeyC?
It's pretty useless XML validation, for both warnings and errors. I say useless because if you have errors, the monkeyc compiler will fail anyway. But I guess it's a super-quick way to validate your XML without actually building....
But if you're curious about those warnings, you can click on your project root and open the Problems tab.....