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其中第1行到第5行是网页框控件父类提供的一些属性，我们暂时不用管，我们把关注点集中在第5行以后。

来对照着网页框控件的源码来看看，由于我们只关注读写XML，所以这里的片段就只贴读写XML相关的部分：

Code Block
languagejava
titlewriteXML
linenumberstrue
collapsetrue
@Override
public void writeXML(XMLPrintWriter writer) {
        super.writeXML(writer);
        writer.startTAG("Attr");
        writer.attr("scrollX", overflowX);
        writer.attr("scrollY", overflowY);
        writer.end();
        if (attr != null) {
            GeneralXMLTools.writeXMLable(writer, attr, RHIframeAttr.XML_TAG);
        }
    }
}