/**
     * HTML4 unescape translator.
     */
    protected static final CharSequenceTranslator UNESCAPE_HTML4 = new AggregateTranslator(
            new LookupTranslator(EntityArrays.BASIC_UNESCAPE), new LookupTranslator(EntityArrays.ISO8859_1_UNESCAPE),
            new LookupTranslator(EntityArrays.HTML40_EXTENDED_UNESCAPE), new NumericEntityUnescaper());

    /**
     * Default character encoding for content extraction.
     */