I have just finished adding the svn:externals property to our SVN repository at university, to enable pulling the commits from our Project eID repository.
We were recently given a Subversion repository for project purposes at our university which is at http://repos.cse.mrt.ac.lk/05/cnwisg2/. But as we are already having setup our Project eID repository at http://svn.project-eid.org/eid/ I thought of using svn:externals at the CSE repository, thanks to Senaka for proposing the idea.
I used TortoiseSVN to do this, though this can be done with any SVN client (including the geekey command line client). Thanks to this and this, now things are working fine.
Just for the information I used the following properties with svn:externals
trunk http://svn.project-eid.org/eid/trunk/ branches http://svn.project-eid.org/eid/branches/