code: public String featureVersion(final String featureName) {
          String version = toString();
          if (featureName != null) {
              version = getReleaseVersionString() + "-" + featureName
                      + (isSnapshot() ? "-" + Artifact.SNAPSHOT_VERSION : "");
          }
          return version;
      }
docs: Gets version with appended feature name.
  
  @param featureName
  Feature name to append.
  @return Version with appended feature name.