code: public FeatureList selectByType(String type) {
  		FeatureList list = new FeatureList();
  		for (FeatureI f : this) {
  			if (f.type().equals(type)) {
  				list.add(f);
  			}
  		}
  
  		return list;
  	}
docs: Create a list of all features that are of the specified type, as defined by
  the type() method of the features.
  This might be, for example, "exon" or "CDS".
  
  @param type The type to match.
  @return A list of features of the specified type.