using ant for web-app deployment

[Torgeir Veimo]

I want to use Ant for deployment of a web-app into a tomcat 4.0 instance
that initially doesn't know about the web-app, thus there is not Context
section for that web-app in server.xml. Thus it's not enough to simply
create / copy a web-application directory under
jakarta-tomcat-4.0/webapps. 

Does anyone have any working example of how to automatically alter the
server.xml file to include a newly added web-application? 

-- 
- Torgeir