@XmlElement(name="language")
private final List<Language> languages = new LinkedList<>();
@XmlElement(name="metric")
@XmlElementWrapper(name="metrics")
private final List<Metric> metrics = new LinkedList<>();
<BUG>@XmlElement(name="characteristic")

@XmlElementWrapper(name="characteristics")
private final List<Characteristic> characteristics = new LinkedList<>();</BUG>
@XmlJavaTypeAdapter(MapAdapter.class)

@XmlElement(name="language")
private final List<Language> languages = new LinkedList<>();
@XmlElement(name="metric")
@XmlElementWrapper(name="metrics")
private final List<Metric> metrics = new LinkedList<>();
@XmlElement(name="characteristics")
@XmlList
private final List<Characteristic> characteristics = new LinkedList<>();
@XmlJavaTypeAdapter(MapAdapter.class)
