Pagination and General Styles
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# Pagination and General Styles

## 1. Understanding XSL FO Margins

To make sense of the parameters in this section, it's useful to consider Figure 1, “Page Model”.

Figure 1. Page Model

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First, let's consider the regions on the page.

The white region is the physical page. Its dimensions are determined by the `page.height` and `page.width` parameters.

The yellow region is the region-body. The size and placement of the region body is constrained by the dimensions labelled in the figure.

The pink region at the top of the page is the region-before. The darker area inside the region-before is the header text. In XSL, the default display alignment for a region is `before`, but the DocBook stylesheets still explicitly make it `before`. That's why the darker area is at the top.

The pink region at the bottom of the page is the region-after. The darker area is the footer text. In XSL, the default display alignment for a region is `before`, but the DocBook stylesheets explicitly make it `after`. That's why the darker area is at the bottom.

The dimensions in the figure are:

1. The page-master margin-top.

2. The region-before extent.

3. The region-body margin-top.

4. The region-after extent.

5. The page-master margin-bottom.

6. The region-body margin-bottom.

7. The sum of the page-master margin-left and the region-body margin-left. In DocBook, the region-body margin-left is zero by default, so this is simply the page-master region-left.

8. The sum of the page-master margin-right and the region-body margin-right. In DocBook, the region-body margin-right is zero by default, so this is simply the page-master region-left.

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