Combining XML Nodes into a single node with an XSLT - asp.net

Question

I'm trying to edit some XML with a transform but I'm struggling to achieve my desired results.
I have some XML:
<FX>
<Order ATTRIBUTE1="ACTIVE" ATTRIBUTE2="CCY" />
<Attribute NAME="N1" VALUE="V1" />
<Attribute NAME="N2" VALUE="V2" />
<Attribute NAME="N3" VALUE="V3" />
</FX>
And I want to transform it to look like:
<FX>
<Order ATTRIBUTE1="ACTIVE" ATTRIBUTE2="CCY" />
<Attribute NAME="N1, N2, N3" VALUE="V1,V2,V3" />
</FX>
Is this possible? Can anyone offer any suggestions on how to do this with a transform?

Answer 1

You can use the following, Asp.NET compatable, XSLT-1.0 stylesheet to perform an XSLT transformation from your source XML to your destination XML:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/FX">
<xsl:copy>
<xsl:copy-of select="Order" />
<Attribute>
<xsl:attribute name="NAME">
<xsl:for-each select="Attribute">
<xsl:value-of select="#NAME" />
<xsl:if test="position() != last()">
<xsl:text>, </xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:attribute>
<xsl:attribute name="VALUE">
<xsl:for-each select="Attribute">
<xsl:value-of select="#VALUE" />
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:attribute>
</Attribute>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Its output is:
<FX>
<Order ATTRIBUTE1="ACTIVE" ATTRIBUTE2="CCY"/>
<Attribute NAME="N1, N2, N3" VALUE="V1,V2,V3"/>
</FX>

Answer 2

In general, if you want to transform some nodes but keep the rest you use the identity transformation template as the starting point and then add templates that change those nodes you want to change:
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="FX/Attribute[1]">
<xsl:copy>
<xsl:apply-templates select="#*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="FX/Attribute[position() > 1]"/>
<xsl:template match="FX/Attribute[1]/#*">
<xsl:attribute name="{name()}">
<xsl:for-each select=". | ../following-sibling::Attribute/#*[name() = name(current())]">
<xsl:if test="position() > 1">,</xsl:if>
<xsl:value-of select="."/>
</xsl:for-each>
</xsl:attribute>
</xsl:template>
</xsl:stylesheet>
https://xsltfiddle.liberty-development.net/jyH9rNk