How to test whether a file exist in a ssi page?

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Hi all,

how can I test whether a file exist in a ssi page?

I have following 
<!--#set var="name" value="$DOCUMENT_ROOT/2008/88/test.html" -->
which will return me the path of the file that I need to include if
exists. 

Now I want to test whether or not this file exists.

A working but ugly way is the following:
<!--#config errmsg=""-->
<!--#include virtual="/2008/88/test.html"-->

I would like to do something:
<!--#if expr="$DOCUMENT_ROOT/2008/88/test.html"-->
<!--#include virtual="/2008/88/test.html"-->
<!--#else -->
No information available.
<!--#endif -->

Where I do not know which expression to use to do
expr="$DOCUMENT_ROOT/2008/88/test.html EXIST" 

TIA for any ideas.

salu2
-- 
Thorsten Scherler                                 thorsten.at.apache.org
Open Source Java                      consulting, training and solutions


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