<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
      <fo:simple-page-master master-name="simplePM"
                    page-height="25cm"
                    page-width="20cm"
                    margin-top="1cm"
                    margin-bottom="1cm"
                    margin-left="1.5cm"
                    margin-right="1.5cm">
        <fo:region-body margin-top="3cm" margin-bottom="3cm"/>
        <fo:region-before extent="2.5cm"/>
        <fo:region-after extent="2.5cm"/>
      </fo:simple-page-master>
  </fo:layout-master-set>

  <fo:page-sequence master-reference="simplePM">
      <fo:flow flow-name="xsl-region-body">
      <fo:block>
        This is Page Number <fo:page-number/>.
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>