code: private Content.Type getContentType(String suffix) {
  		List<Content.Type<?>> cts = project.getParent().getContentTypes();
  		//
  		for (int i = 0; i != cts.size(); ++i) {
  			Content.Type<?> ct = cts.get(i);
  			if (ct.getSuffix().equals(suffix)) {
  				// hit
  				return ct;
  			}
  		}
  		// miss
  		throw new IllegalArgumentException("unknown content-type: " + suffix);
  	}
docs: Determine the content type from the suffix of a given build/includes
  attribute entry.
  
  @param suffix
  @return