lockmethod fo maintenance work 维修时的锁定方法
XML-oriented "formatting objects" (fo) is much the same: while powerful, it demands quite a bit of machinery be in place before it begins to work.
面向XML的“格式化对象”(FO)与它非常相像：尽管功能很强大，但是它在开始工作之前需要进行许多工作。
The great advantage to using FO is that you need to work with only one document format in any platform or application.
使用 FO 的最大好处在于：不管在什么平台下或使用什么应用程序，您只需使用一种文档格式。
Problems arise because the XSL-FO renderer has a bunch of blocks to work with and it does not know how they are related to each other.
之所以出现这些问题，是因为XSL - fo渲染器要处理一长串块，但却不知道这些块之间的关系。
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