Markus Schirp wrote in post #998159:
> The configuration file can be plain ruby!
> You can define your own DSL to manage the formulars.
> So you can load the file once and the formulars do not have to be
> evaled...

Nice catch. Actually I did try to implement it as DSL at the beginning, 
but finally I realized it is difficult to implement such a DSL in my 
problem. So at last I went to the XML format configuration way.

Below is the post I asked about DSL in 5 months ago:
http://www.ruby-forum.com/topic/696974#new

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