Every so often we get asked where the schema file is for the MSBuild XML. People (correctly) assume we have one since it is referenced as a namespace in every project file.
Our schema is installed in \windows\Microsoft.NET\framework\v2.0.50727\Microsoft.Build.xsd. If you install Visual Studio you can also find it under \Program Files\Microsoft Visual Studio 8\xml\Schemas\1033.
Thanks for pointing this out to me, Faisal!
[ Author: Neil Enns ]