Definition and Usage
定义和用法

The <fo:conditional-page-master-reference> object specifies a page-master to be used when the conditions defined are true.
<fo:conditional-page-master-reference>对象的作用是：指定一个当条件为True时所使用的页主[page-master]。

This allows different page-masters to be used for different pages (e.g. odd and even pages, first page, blank pages).
该对象允许针对不同的页面使用不同的页主（例如：奇数页面或偶数页面，第一页以及空白页）

Three properties, page-position, odd-or-even, blank-or-not-blank, specifies the conditions. All three conditions must be true for the <fo:conditional-page-master-reference> to be true.
有三个属性用来指定具体条件，即page-position[页面位置]、odd-or-even[奇偶页面]、blank-or-not-blank[空白页面]。上述三个条件必须都为true， <fo:conditional-page-master-reference>也同为true：

• page-position is true if the generated page has the specified position (first, last, rest, any)
  如果产生的页面已经指定了位置，那么page-position[页面位置]为true[真]
• odd-or-even is true if the value is "any" or if the value (odd, even) matches the page number
  如果值为“any”或值（奇、偶）数与页面数相匹配，那么odd-or-even[奇、偶数]为true[真]
• blank-or-not-blank is true, if the value is "not-blank" and the page has areas generated by descendants of <fo:flow>; if the value is "blank" and the page has no areas from <fo:flow>; or if the value is "any"
  如果值为"not-blank[无空白页]"并且页面包含由<fo:flow>子对象产生的域；或者值为"blank[空白]"并且页面不包含来自于<fo:flow>的域；或者值为"any"。只要满足上述三者之一，“blank-or-not-blank ”的值就为true[真]

Syntax
语法

<fo:conditional-page-master-reference> <!--	Contents:EMPTY -->
</fo:conditional-page-master-reference>

Properties
属性

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