Variable expansion in svn:externals

I would like to set up a path in a repository that has an svn:externals
property that points to a different value depending on who is performing
the check out.

I have tried having an svn:externals with a value of "xml
svn+ssh://localhost/home/svn/some-project/${LOGNAME}/head"

When I check out the directory that has the svn:externals value, I get
the following error message:

../subversion/libsvn_fs/tree.c:186: (apr_err=160013)
svn: Filesystem has no item
svn: file not found: transaction `9f', path
`/accomplishments/${LOGNAME}/head'

I am guessing that this is because variable expansion did not occur on
${LOGNAME}.

Is there a way to get svn to do this type of user specific check out?

-- 
Keith Richling                     |  Agilent Technologies
Email: keith_richling@agilent.com  |  MS/72
Voice: (970) 288-7903              |  4380 Ziegler Road
  Fax: (970) 288-6580              |  Fort Collins, CO 80525-9790
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