<root>
   <user>
       <name>Вася Пупкин</name>
       <traffic> 150 </traffic>
   </user>
   <user>
       <name>Петя Хвостов</name>
       <traffic> 290 </traffic>
   </user>
   <user>
       <name>Галя Фывина</name>
       <traffic> 630 </traffic>
   </user>
</root>

<?xml version='1.0' encoding='windows-1251'?>

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

  <xsl:output method="xml" indent="yes" />
  
  <?xml-stylesheet type="text/xsl" href="people_.xsl"?>
  
  <xsl:template match="/root">
    <people>
      <xsl:apply-templates select="user"/> 
    </people>
  </xsl:template>
  
  <xsl:template match="user">
    <record>
      <name>
       <xsl:value-of select="substring-before(name, ' ')" />
      </name>
      <traffic>
        <xsl:value-of select="traffic"/>
      </traffic>
    </record>
  </xsl:template>

</xsl:stylesheet>

<people>
   <record>
      <name>Вася</name>
      <traffic> 150 </traffic>
   </record>
   <record>
      <name>Петя</name>
      <traffic> 290 </traffic>
   </record>
   <record>
      <name>Галя</name>
      <traffic> 630 </traffic>
   </record>
</people>