<xsl:variable name="code_start" select="'128a/'"/>
<xsl:variable name="bank_contract" select="format-number( '818', '00000' )"/>
<xsl:variable name="count" select="format-number( @contract, '00000000000000' )"/>
<xsl:variable name="summ" select="format-number(counter:get('total') * 100, '00000000')"/>
<xsl:variable name="params" select="concat($bank_contract, $count, $summ)"/>
<fo:external-graphic width="6.5cm" height="1.1cm">
   <xsl:attribute name="src"><xsl:value-of select="concat('barcode:///', $code_start, $params)"/></xsl:attribute>
</fo:external-graphic>