While XSLT does not define while and for loops, their behavior can be simulated. : template « XSLT stylesheet « XML Tutorial

1. XML Tutorial
2. XSLT stylesheet
3. template

File: Data.xml

<?xml version="1.0" encoding="utf-8"?>
<data>
    <AAA repeat="3"/>
    <BBB repeat="2"/>
    <CCC repeat="5"/>
</data>

File: Transform.xslt

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet
      version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:template match="/data/*">
      <paragraph>
        <xsl:call-template name="for">
          <xsl:with-param name="stop">
            <xsl:value-of select="@repeat"/>
          </xsl:with-param>
        </xsl:call-template>
      </p>
    </xsl:template>
    <xsl:template name="for">
      <xsl:param name="start">1</xsl:param>
      <xsl:param name="stop">1</xsl:param>
      <xsl:param name="step">1</xsl:param>
      <xsl:value-of select="name()"/>
      <xsl:text/>
      <xsl:if test="$start &lt; $stop">
        <xsl:call-template name="for">
          <xsl:with-param name="stop">
            <xsl:value-of select="$stop"/>
          </xsl:with-param>
          <xsl:with-param name="start">
            <xsl:value-of select="$start + $step"/>
          </xsl:with-param>
        </xsl:call-template>
      </xsl:if>
    </xsl:template>
</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?>
    <paragraph>AAAAAAAAA</p>
    <paragraph>BBBBBB</p>
    <paragraph>CCCCCCCCCCCCCCC</p>