Specification of Extensible Stylesheet Language Formatting Object(XSL-FO) is given in W3C Recommendation. XSL-FO has defined many XML tags,which describe how to render the contents.

• XSL格式化对象规范是W3C的正式建议(W3C Recommendation)；通常称其为XSL-FO；XSL-FO定义了许多XML标记；这些标记描述了应如何显示内容.