setting svn:externals

I must be missing something in the documentation but I can't get this to work.

What is an example of usage for the command.

I am trying this on a working copy of a repository

In top level of repo
svn propset svn:externals https://url-to-external-repo trunk/lib/fnmoc

also, how do I add multiple external URLS for the same directory in the repo?
would this work?
svn propset svn:externals <external URL><externalURL> trunk/lib/fnmoc

Thanks in advance for any help.

John

-- 
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AG1(AW/SW) John Christopher
Web Integration Division
(831)656-4447 COM
878-4447 DSN
john.christopher@metnet.navy.mil
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