*/
    protected String getAdditionalData(final ResponseData responseData, final Document document) {
        return "";
    }

    /**
     * Returns the result data footer.
     * @return The result data footer.
     */
    protected String getResultDataFooter() {
        // TODO support other type
        return "</doc>";
    }

    /**
     * Trims space characters from the value.

     */
    protected String getAdditionalData(final ResponseData responseData, final Document document) {
        return "";
    }

    /**
     * Returns the footer for the result data.
     * @return The result data footer.
     */
    protected String getResultDataFooter() {
        // TODO support other type
        return "</doc>";
    }

    /**

        BooleanQuery.Builder outerBuilder = new BooleanQuery.Builder();
        outerBuilder.add(innerBuilder.build(), BooleanClause.Occur.SHOULD);
        outerBuilder.add(new TermQuery(new Term("content", "outer")), BooleanClause.Occur.SHOULD);
        BooleanQuery nestedQuery = outerBuilder.build();

        String[] fields = { "content" };
        List<TermQuery> queryList = SuggestUtil.getTermQueryList(nestedQuery, fields);