code: public static String getPrefixedKey(String preferenceContainerID, String preferenceName) {
  		return getXtextKey(getPropertyPrefix(preferenceContainerID), preferenceName);
  	}
docs: Create a preference key.
  
  @param preferenceContainerID the identifier of the generator's preference container.
  @param preferenceName the name of the preference.
  @return the key.