Using svn:external to point to files

I am a convert to subversion from MS SourceSafe. I have been trying to
duplicate the effect of the SourceSafe 'share' feature where a file can be
shared from one sub-project to another and will track the changes made to it
(not quite the same as branching, so copy is not what I want).

I recently discovered the svn:externals property, which seems to be just
what I want. However, I have a couple of issues with this that aren't clear
from the subversion book or the mailing list correspondence:

Is it possible to make the external property point to an individual file
rather than a whole folder? It doesn't appear to work for me.

If the answer to the above question is 'yes': is it possible to set multiple
svn:external properties to the same destination folder, and even to include
other source in that folder?

As I said above I feel that the subversion book is a little light on this so
when I have got to the bottom of it I am happy to produce some patches to
improve the description, however, I am having difficulty discovering the
source for the documentation. Can someone point me in the right direction
please?

Lastly, thanks for a great piece of software.

Vincent Thornley

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