Har du testat det som står i dokumentationen? Det verkar vara ganska rakt fram, ser det ut som.
Citat:
condition
Turns on conditional logging. If set, requests will be logged only if ServletRequest.getAttribute() is null. For example, if this value is set to junk, then a particular request will only be logged if ServletRequest.getAttribute("junk") == null. The use of Filters is an easy way to set/unset the attribute in the ServletRequest on many different requests.
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http://tomcat.apache.org/tomcat-6.0-doc/co...nfig/valve.html