Transformation from custom format to XML format using XSLT

I converted my XML format to user defined format using XSLT. But now I want the XSLT to transform the user defined format data into original XML format. How can I achieve it using XSLT. Here I am attaching my XML as well as the XSLT code.

<?xml version="1.0" encoding="UTF-8"?>
<FLIGHT_TABLE>
  <ZSCARR_LINE>
    <CARRID>AA</CARRID>
    <CARRNAME>American Airlines</CARRNAME>
    <CURRCODE>USD</CURRCODE>
  </ZSCARR_LINE>
  <ZSCARR_LINE>
    <CARRID>AB</CARRID>
    <CARRNAME>Air Berlin</CARRNAME>
    <CURRCODE>EUR</CURRCODE>
  </ZSCARR_LINE>
  <ZSCARR_LINE>
    <CARRID>AC</CARRID>
    <CARRNAME>Air Canada</CARRNAME>
    <CURRCODE>CAD</CURRCODE>
  </ZSCARR_LINE>
  <ZSCARR_LINE>
    <CARRID>AF</CARRID>
    <CARRNAME>Air France</CARRNAME>
    <CURRCODE>EUR</CURRCODE>
  </ZSCARR_LINE>
</FLIGHT_TABLE>

And my XSLT Code:

    <xsl:stylesheet version="1.0" 
xmlns:xsl="http://ift.tt/tCZ8VR">
<xsl:output method="text" encoding="UTF-8"/>

<xsl:template match="/*">
    <!-- header -->
    <xsl:text>Data-[{</xsl:text>
    <xsl:for-each select="*[1]/*">
        <xsl:value-of select="local-name()"/>
        <xsl:if test="position()!=last()">
            <xsl:text>,</xsl:text>
        </xsl:if>
    </xsl:for-each>
    <xsl:text>},</xsl:text>

    <!-- data -->
    <xsl:for-each select="*">
        <xsl:text>{</xsl:text>
        <xsl:for-each select="*">
            <xsl:value-of select="."/>
            <xsl:if test="position()!=last()">
                <xsl:text>,</xsl:text>
            </xsl:if>
        </xsl:for-each>
        <xsl:text>}</xsl:text>
        <xsl:if test="position()!=last()">
            <xsl:text>,</xsl:text>
        </xsl:if>
    </xsl:for-each>
    <xsl:text>]</xsl:text>
</xsl:template>
</xsl:stylesheet>

The output will be:

Data-[{CARRID,CARRNAME,CURRCODE},{AA,American Airlines,USD},{AB,Air Berlin,EUR},{AC,Air Canada,CAD},{AF,Air France,EUR}]

So now my requirement is like I want to again convert the above data into XML. Please help me find the solution for it.

Thanks, Kishore