title: Quickly get a list of all svn:externals for a remote svn repository
body: <p>We have an svn repository with lots of directories and files and our build system needs to be able to find all of the svn:externals properties, recursively for a branch in the repository, before checking it out. Currently we use:</p>
  
  <pre><code>svn propget svn:externals -R http://url.of.repo/Branch
  </code></pre>
  
  <p>This has proved extremely time consuming and is a real bandwidth hog. It appears that the client is receiving all of the props for everything in the repo and doing the filtering locally (though I haven't confirmed this with wireshark). Is there a faster way to do this? Preferably some way of getting the server to only return the desired data.</p>