Don Hamilton wrote:
> in /home/wwwlib/public_html, and is accessed by http://url/wwwlib, but the
> index entries say http://url/home/wwwlib/public_html.

In your user.config:
  ReplaceRules replace /home/wwwlib/public_html /wwwlib

I think that should do it.  If not exactly that then something similar. 
There are replace, prepend, append, and remove options for
ReplaceRules.  You can use regular expressions to do more complex
pattern matching.

The manual outlines the syntax and gives simple examples:
  http://sunsite.berkeley.edu/SWISH-E/Manual/replacerules.html

-- 
,David Norris
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