title: What are greenfield and brownfield applications?
body: <p>I read the following sentence in the <a href="http://wiki.fluentnhibernate.org/Auto_mapping" rel="noreferrer">Fluent NHibernate wiki</a>:</p>
  
  <blockquote>
    <p>...; however, for most <em>greenfield</em> applications (and quite a few <em>brownfield</em> ones too) auto mapping will be more than capable.</p>
  </blockquote>
  
  <p>What are greenfield and brownfield applications?</p>