xsl: preserving spaces preserves only one space?

I am trying to preserve spaces but it is not working. 
The data displays but it only puts one space between
each item when some items have more then one space
between them.  Can someone help me please?  Here is a
the xsl code.

The path of the item I am trying to preserve can be
seen in the detail template.

<?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:preserve-space elements="transaction_detail"/>

 <xsl:template match="/">
  <fo:root
xmlns:fo="http://www.w3.org/1999/XSL/Format">
  
   <fo:layout-master-set>
     <fo:simple-page-master master-name="simple"
                   page-height="29.7cm" 
                   page-width="21cm"
                   margin-top="1cm" 
                   margin-bottom="2cm" 
                   margin-left="2.5cm" 
                   margin-right="2.5cm">
       <fo:region-body margin-top="3cm"/>
       <fo:region-before extent="3cm"/>
       <fo:region-after extent="1.5cm"/>
     </fo:simple-page-master>
   </fo:layout-master-set>
 
 
   <fo:page-sequence master-reference="simple">
   	<fo:flow flow-name="xsl-region-body">
		<fo:block>
			<xsl:call-template name="detail"/>			
		</fo:block>
   	</fo:flow>
   </fo:page-sequence>
  </fo:root> 
 </xsl:template>


 <!-- DATA FIELD TEMPLATES -->
<xsl:template name="detail">
	<xsl:for-each select="/invoice/detail/row">
		<fo:block font-size="10pt">
				<xsl:value-of select="transaction_detail"/>
		</fo:block>
	</xsl:for-each> 
</xsl:template>
</xsl:stylesheet>


		
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