To make sense of the parameters in this section, it's useful to consider Figure 1, “Page Model”.
First, let's consider the regions on the page.
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
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
but the DocBook stylesheets explicitly make it
after. That's why the darker area is at the bottom.
The dimensions in the figure are:
The page-master margin-top.
The region-before extent.
The region-body margin-top.
The region-after extent.
The page-master margin-bottom.
The region-body margin-bottom.
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 margin-left.
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 margin-right.
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