Definition and Usage
定义和用法

The <fo:leader> object can be used used to:
<fo:leader>对象的作用如下：

• generate "." to separate titles from page numbers in table of contents
  产生一个“.”符号来分隔内容表格中页面数字的标题。
• create input fields in forms
  创建字段输入表单
• create horizontal rules
  创建水平规则

If the leader's length is too long to fit in the area, the leader will begin a new line.
如果前导字符长度太长，与整个区域明显不适应，那么它将会令起一行。

The children of the <fo:leader> object are ignored unless the leader-pattern property is "use-content". If the <fo:leader> has no children and the leader-pattern property is "use-content", the leader is filled with blank space.
只用在leader-pattern属性设置为“use-content”的情况下，<fo:leader>对象的子类才会被忽略；如果<fo:leader>不包含子类，并且leader-pattern属性设置为“use-content”，那么前导字符才会被填充为空白。

If the leader should fill all space on a line, the max length of the leader should be at least as large as the width of the column.
如果前导字符需要在一行中填充空格，那么前导字符的最大长度至少与列的宽度相同。

Syntax
语法

<fo:leader> <!--	Contents:(#PCDATA|bidi-override|character|	external-graphic|instream-foreign-object|	inline|page-number|page-number-citation|	basic-link|multi-toggle)* -->
</fo:leader>

Properties
属性

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