XSL Transformation to create XML nodes dynamically - xslt

Question

Source XML :
<AWARD>
<FIELD1>XYZ</FIELD1>
<AWARDLINE>
<ALINENUM>1</ALINENUM>
<SHIPMENT>
<SHIPLINENUM>1.1</SHIPLINENUM>
<ACCOUNT>
<ACCOUNTLINENUM>1.1.1</ACCOUNTLINENUM>
<ASSOCIATEDREQ>
<AREQNUM>1.1.1.1</AREQNUM>
</ASSOCIATEDREQ>
</ACCOUNT>
</SHIPMENT>
</AWARDLINE>
<AWARDLINE>
<ALINENUM>2</ALINENUM>
</AWARDLINE>
</AWARD>
Apart from AWARD all the child nodes "AWARDLINE" , "SHIPMENT", "ACCOUNT", "ASSOCIATEDREQ" may exist or may not exist.
As seen above, AWARDLINE 2 does not have SHIPMENT/ACCOUNT/ASSOCIATEDREQ nodes.
Desired Target XML
<AWARD>
<FIELD1>XYZ</FIELD1>
<AWARDLINE>
<ALINENUM>1</ALINENUM>
<SHIPMENT>
<SHIPLINENUM>1.1</SHIPLINENUM>
<ACCOUNT>
<ACCOUNTLINENUM>1.1.1</ACCOUNTLINENUM>
<ASSOCIATEDREQ>
<AREQNUM>1.1.1.1</AREQNUM>
</ASSOCIATEDREQ>
</ACCOUNT>
</SHIPMENT>
</AWARDLINE>
<AWARDLINE>
<ALINENUM>2</ALINENUM>
<SHIPMENT>
<ACCOUNT>
</ASSOCIATEDREQ>
</ACCOUNT>
</SHIPMENT>
</AWARDLINE>
</AWARD>

Answer 1

You can use this XSLT-1.0 which does a replacement of all relevant nodes if they are present. It does selectively reconstruct the structure of the AWARDLINE element and works in combination with the identity template.
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<!-- identity template -->
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*" />
</xsl:copy>
</xsl:template>
<!-- reconstruction of the AWARDLINE element structure -->
<xsl:template match="AWARDLINE">
<xsl:copy>
<xsl:copy-of select="*[not(self::SHIPMENT)]" />
<SHIPMENT>
<xsl:copy-of select="SHIPMENT/*[not(self::ACCOUNT)]" />
<ACCOUNT>
<xsl:copy-of select="SHIPMENT/ACCOUNT/*[not(self::ASSOCIATEDREQ)]" />
<ASSOCIATEDREQ>
<xsl:copy-of select="SHIPMENT/ACCOUNT/ASSOCIATEDREQ/*" />
</ASSOCIATEDREQ>
</ACCOUNT>
</SHIPMENT>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Another possibility is using templates. This can process more than one SHIPMENT element and creates the empty structure if no other elements are present.
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<!-- identity template -->
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*" />
</xsl:copy>
</xsl:template>
<!-- reconstruction of the AWARDLINE element structure -->
<xsl:template match="AWARDLINE">
<xsl:copy>
<xsl:copy-of select="*[not(self::SHIPMENT)]|#*" />
<xsl:apply-templates select="SHIPMENT" />
</xsl:copy>
</xsl:template>
<xsl:template match="AWARDLINE[not(SHIPMENT)]">
<xsl:copy>
<xsl:copy-of select="*|#*" />
<SHIPMENT>
<ACCOUNT>
<ASSOCIATEDREQ />
</ACCOUNT>
</SHIPMENT>
</xsl:copy>
</xsl:template>
<xsl:template match="SHIPMENT">
<xsl:copy>
<xsl:copy-of select="*[not(self::ACCOUNT)]|#*" />
<xsl:apply-templates select="ACCOUNT" />
</xsl:copy>
</xsl:template>
<xsl:template match="SHIPMENT[not(ACCOUNT)]">
<xsl:copy>
<xsl:copy-of select="*|#*" />
<ACCOUNT>
<ASSOCIATEDREQ />
</ACCOUNT>
</xsl:copy>
</xsl:template>
<xsl:template match="ACCOUNT">
<xsl:copy>
<xsl:copy-of select="*[not(self::ASSOCIATEDREQ)]|#*" />
<xsl:apply-templates select="ASSOCIATEDREQ" />
</xsl:copy>
</xsl:template>
<xsl:template match="ACCOUNT[not(ASSOCIATEDREQ)]">
<xsl:copy>
<xsl:copy-of select="*|#*" />
<ASSOCIATEDREQ />
</xsl:copy>
</xsl:template>
<xsl:template match="ASSOCIATEDREQ">
<xsl:copy>
<xsl:copy-of select="*|#*" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>