title: what is api-paste.ini file in openstack
body: <p>I've seen api-paste.ini as a conf file after installing openstack.
  It looks like substituting some prefixes for python implementation but have no clue about this.
  Here, my questions are:</p>
  
  <p>What script is it? 
  it looks like very bizarre grammar like the following:</p>
  
  <pre><code>[composite:metadata]
  use = egg:Paste#urlmap
  /: meta
  </code></pre>
  
  <p>How does it work within python script?</p>