jdon 论坛的 DataUnformatFilter 类是做什么用的？看不懂

    public XMLProperties(String file) {
        this.file = new File(file);
        try {
            SAXBuilder builder = new SAXBuilder();
            // Strip formatting
            DataUnformatFilter format = new DataUnformatFilter();
            builder.setXMLFilter(format);
            doc = builder.build(new File(file));
        }
        catch (Exception e) {
            System.err.println("Error creating XML parser in "
                + "PropertyManager.java");
            e.printStackTrace();
        }
    }

<p>

            DataUnformatFilter format = new DataUnformatFilter();
            builder.setXMLFilter(format);

<p>