xsl fo pdf fop - Not getting the expected dimensions

Hello and thank you for reading my post.

Below are the XSL stylesheet and the XML data files I am using.
Given these two files and using "fop" (1.0) emebeded in a Java application I
generate a resulting PDF document which basically consists of a 210mm x
297mm page containing a rectangle with the "Hello World" string inside.
My problem is that, even though I am specifying I would like that rectangle
to be 100mm x 200mm in the XML file (see below), I get a 94mm x 189mm area
when I print the generated PDF document and measure it with a ruler.

Can you help me understand what's happening?

I was wondering if maybe some kind of "reset" (comparable to a CSS reset
like *{padding: 0; margin: 0;}) might have to be done prior to working?

Thank you for helping.
Best regards.




XSL stylesheet

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                              xmlns:fo="http://www.w3.org/1999/XSL/Format">
                              
  <xsl:template match="quotation">
    
    <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
    
      <fo:layout-master-set>
        <fo:simple-page-master master-name = "simple_page_master" 
                               page-height = "{@page_height}"
                               page-width  = "{@page_width}"                                          
                               >
                                       
          <fo:region-body />
          
        </fo:simple-page-master>
      </fo:layout-master-set>

      <fo:page-sequence master-reference="simple_page_master">
        <fo:flow flow-name="xsl-region-body">
          <xsl:apply-templates select="area" />
        </fo:flow>
      </fo:page-sequence>
    </fo:root>
        
  </xsl:template>
  
  <xsl:template match="area">
  
    <xsl:variable name="top">
      <xsl:value-of select="top" />
    </xsl:variable>
        
    <xsl:variable name="left">
      <xsl:value-of select="left" />
    </xsl:variable>
        
    <xsl:variable name="height">
      <xsl:value-of select="height" />
    </xsl:variable>
        
    <xsl:variable name="width">
      <xsl:value-of select="width" />
    </xsl:variable>
    
    <fo:block-container position = "absolute"
              top      = "{$top}"
              left     = "{$left}"
              height   = "{$height}"
              width    = "{$width}"
              background-color = "DarkSlateGray">
      
      <fo:block>
        <xsl:value-of select="content" />
      </fo:block>            

      
    </fo:block-container>
  </xsl:template>
  
</xsl:stylesheet>


XML data

<?xml version="1.0" encoding="UTF-8"?>
<quotation page_height='297mm' 
           page_width='210mm'>
  <area>
      <top>0mm</top>
      <left>0mm</left>
      <height>200mm</height>
      <width>100mm</width>
      <content>Hello World</content>    
  </area>
</quotation>

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Received on Friday, 25 May 2012 14:04:58 UTC