Treating my repository as a SVN repo, I get:
svn co http://myrepo/foo/trunk foo
...
foo/
bar/
baz/ -> http://myrepo/baz/trunk
Treati
The best means of integrating svn externals with git-svn that I've seen is this script, which clones your externals into a .git_externals/ directory and creates the symlinks and exclude files you need. I find this a simple and direct solution. YMMV.
Here is an older overview of other options for dealing with svn externals with git-svn. To me they look a little over-complicated and liable to break under subsequent Git use.