docs: public static AssertionInfo getAssertion(Message message)
  			throws SAXException, IOException, ParserConfigurationException {
  		AssertionInfoMap aim = message.get(AssertionInfoMap.class);
  		
  		if (aim != null) {
  			Collection<AssertionInfo> ais = aim
  					.get(CompressionPolicyBuilder.COMPRESSION);
  
  			if (ais == null) {
  				return null;
  			}
  
  			for (AssertionInfo ai : ais) {
  				if (ai.getAssertion() instanceof CompressionAssertion) {
  					return ai;
  				}
  			}
  		}
  
  		return null;
  	}