XSLT: How to convert XML Node to String

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You need to serialize the nodes. The most simple for your example would be something like

<xsl:template match="ROOT">
  <xsl:variable name="nodestring">
    <xsl:apply-templates select="//A" mode="serialize"/>
  </xsl:variable>
  <xsl:value-of select="$nodestring"/>  
</xsl:template>

<xsl:template match="*" mode="serialize">
  <xsl:text>&lt;</xsl:text>
  <xsl:value-of select="name()"/>
  <xsl:text>&gt;</xsl:text>
  <xsl:apply-templates mode="serialize"/>
  <xsl:text>&lt;/</xsl:text>
  <xsl:value-of select="name()"/>
  <xsl:text>&gt;</xsl:text>
</xsl:template>

<xsl:template match="text()" mode="serialize">
  <xsl:value-of select="."/>
</xsl:template>

The above serializer templates do not handle e.g. attributes, namespaces, or reserved characters in text nodes, but the concept should be clear. XSLT process works on a node tree and if you need to have access to “tags”, you need to serialize the nodes.

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