From http://www.w3schools.com (Copyright Refsnes Data)

XSL-FO simple-page-master Object

Definition and Usage

The <fo:simple-page-master> object defines the size and shape of a page. There will be one named simple-page-master for each page layout.

A page can contain up to five regions: region-body, region-before, region-after, region-start, and region-end.

The <fo:simple-page-master> will be referenced from a <fo:page-sequence-master> object or from a <fo:page-sequence> object.

Syntax

<fo:simple-page-master>
  <!--
	Contents:(region-body,region-before?,
	region-after?,region-start?,region-end?)
  -->
</fo:simple-page-master>

Properties

Property
end-indent
margin-bottom
margin-left
margin-right
margin-top
master-name
page-height
page-width
reference-orientation
space-after
space-before
start-indent
writing-mode

Example 1

XSL-FO documents have a structure like this:

<?xml version="1.0" encoding="ISO-8859-1"?>

<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">

<fo:layout-master-set>
  <fo:simple-page-master master-name="A4">
    <!-- Page template goes here -->
  </fo:simple-page-master>
</fo:layout-master-set>

<fo:page-sequence master-reference="A4">
  <!-- Page content goes here -->
</fo:page-sequence>

</fo:root>

Example 2

A "real" XSL-FO example:

<?xml version="1.0" encoding="ISO-8859-1"?>

<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">

<fo:layout-master-set>
<fo:simple-page-master master-name="A4">
</fo:simple-page-master>
</fo:layout-master-set>

<fo:page-sequence master-reference="A4">
<fo:flow flow-name="xsl-region-body">
<fo:block>Hello W3Schools</fo:block>
</fo:flow>
</fo:page-sequence>

</fo:root>

The output from the code above would be something like this:

Hello W3Schools