master.xml

<data>
	<event-storage>
		<group id="event">
			<item id="International Bat Night - Bangers, Burgers &amp; Bats!">
				<item id="event-id">5632</item>
				<item id="adult-ticket">
					<item id="quantity-chosen">4</item>
					<item id="ticket-name">Adult Ticket</item>
					<item id="ticket-id">5630</item>
					<item id="ticket-price">20</item>
					<item id="total">80</item>
				</item>
				<item id="child-ticket-over-7s-only">
					<item id="quantity-chosen">2</item>
					<item id="ticket-name">Child ticket (over 7's only)</item>
					<item id="ticket-id">5631</item>
					<item id="ticket-price">8.50</item>
					<item id="total">17</item>
				</item>
			</item>
			<item id="Introduction to Bushcraft">
				<item id="event-id">5629</item>
				<item id="introduction-to-bushcraft">
					<item id="quantity-chosen">4</item>
					<item id="ticket-name">Introduction to Bushcraft</item>
					<item id="ticket-id">5628</item>
					<item id="ticket-price">80</item>
					<item id="total">320</item>
				</item>
			</item>
		</group>
	</event-storage>
</data>

master.xsl

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

  <xsl:output method="xml" indent="yes" />


<xsl:template match="data">
	<xsl:apply-templates select="//data/event-storage/group/item/item[@id !='event-id']" mode="tickets"/>
</xsl:template>


<xsl:template match="//data/event-storage/group/item/item" mode="tickets">
  <xsl:call-template name="selects">
    <xsl:with-param name="num">1</xsl:with-param>
    <xsl:with-param name="count">
      <xsl:value-of select="item[@id ='quantity-chosen']"/>
    </xsl:with-param>
  </xsl:call-template>
</xsl:template>  


<xsl:template name="selects">
  <xsl:param name="num"/>
  <xsl:param name="count"/>  
  <xsl:if test="$num <= $count">
    <xsl:call-template name="tickets">      
	  <xsl:with-param name="number"><xsl:value-of select="$num + 1"/></xsl:with-param>   
	</xsl:call-template>
    <xsl:call-template name="selects">
      <xsl:with-param name="num">
        <xsl:value-of select="$num + 1"/>
      </xsl:with-param>
      <xsl:with-param name="count">
        <xsl:value-of select="$count"/>
      </xsl:with-param>     
    </xsl:call-template>
  </xsl:if>
</xsl:template>


<xsl:template name="tickets">
  <div class="ticket">
    <input name="tickets-sold[fields][{position()}][ticket]" type="hidden" value="{item[@id='ticket-id']}"/>
    <input name="tickets-sold[fields][{position()}][event]" type="hidden" value="{../item[@id ='event-id']}"/>
    <input name="tickets-sold[fields][{position()}][quantity]" type="hidden" value="{item[@id='quantity-chosen']}"/>
  </div>
</xsl:template>  

</xsl:stylesheet>