It's much better if you post sample input that's well formed, then
people can use it to test possible answers. Your input had multiple top
level elements and spaces after </ neither of which are allowed in XML.
As I posted the other day, to do this in xlst1, just process elements
one at a time working along the following-sibling axis, passing the
string as a parameter.
<x>
<main-element>
<fid id='DATA_STATUS'>0</fid>
</main-element >
<main-element>
<fid id='DATA_STATUS'>1</fid>
</main-element >
<main-element>
<fid id='DATA_STATUS'>2</fid>
</main-element >
</x>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="x">
<x>
<xsl:apply-templates select="*[1]">
<xsl:with-param name="str" select="'abc|def'"/>
</xsl:apply-templates>
</x>
</xsl:template>
<xsl:template match="main-element">
<xsl:param name="str"/>
<header>
<xsl:value-of select="substring-before(concat($str,'|'),'|')"/>
</header>
<xsl:variable name="newstr">
<xsl:choose>
<xsl:when test="contains($str,'|')">
<xsl:value-of select="substring-after($str,'|')"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$str"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:copy-of select="."/>
<xsl:apply-templates select="following-sibling::*[1]">
<xsl:with-param name="str" select="$newstr"/>
</xsl:apply-templates>
</xsl:template>
</xsl:stylesheet>
$ saxon sigh.xml sigh.xsl
<?xml version="1.0" encoding="utf-8"?>
<x>
<header>abc</header>
<main-element>
<fid id="DATA_STATUS">0</fid>
</main-element>
<header>def</header>
<main-element>
<fid id="DATA_STATUS">1</fid>
</main-element>
<header>def</header>
<main-element>
<fid id="DATA_STATUS">2</fid>
</main-element>
</x>
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