How do I recursively exclude folders using MSBuild?

I am new to MSBuild and am having some trouble figuring out how to recursively exclude folders of a certain name.  

I know how to just exclude a certain directory like this

<ExcludeFromBuild Include="$(SourceWebPhysicalPath)\someFolder" />

it is also no problem to recursively exclude certain file types like so

<ExcludeFromBuild Include="$(SourceWebPhysicalPath)\**\*.csproj" />

The problem I am running into is when dealing with subversion directories.  In a bunch of the folders on the development site there are .svn folders, which are needed for using subversion.  What I am trying to do is when I build the site, exclude all folders in the site that are named .svn .  I am having some issues getting this to work, so I am hoping someone can point me in the right direction.  I tried

<ExcludeFromBuild Include="$(SourceWebPhysicalPath)\**\.svn" />

but that did not do the trick.

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