title: SVN checkout filtered by file extension?
body: <p>I have a home-grown automated build script in the form of a DOS batch file.  In part of that script, I check out (with "svn checkout") a section of our SVN repository that includes a bunch of third-party stuff that's used in our projects.  This batch file performed pretty well for a long time, but now people have checked in lots of fluff (docs, sample code, etc.) into the third-party area and the checkout part of this script has gotten lots slower.  I'd like to mitigate this by checking out only the stuff we need -- mostly dll files in our case.  So, my question is this: what's the best way to check out an SVN repository filtered by file extension?</p>
  
  <p>I didn't see any obvious way to do this in the svn help.  I have a .NET utility library that wraps svn.exe in some ways, and I was thinking of extending this to retrieve only content that matched my extensions of interest.  But I'd prefer to use an easier or existing method if one exists.</p>