XSLT Template - fieldsToNull for Salesforce; Enumerate the list of blank nodes into a target node

fieldsToNull.xsl

	<!-- The template matching sObjects/sObject/*[not(node())], when selected for execution, does nothing, which results in 
		"deleting" (not copying) the matched node in the output.-->
	<xsl:template match="sObjects/sObject/*[not(node())]"/>

	<!--The template below matching fieldsToNull has a higher priority specified than the "deleting" template above, 
		so it is selected for execution on any fieldsToNull element.
		The matched fieldsToNull element is shallow-copied to the output, 
		and then its content (body) is produced by applying templates in mode enumerate to all empty siblings-elements.
		-->
	<xsl:template match="fieldsToNull" priority="5">
		<fieldsToNull>
			<xsl:apply-templates mode="enumerate" select="../*[not(self::fieldsToNull) and not(node())]"/>
		</fieldsToNull>
	</xsl:template>

	<!-- This template in mode 'enumerate' matches any child element of an sObject element that is a child of a sObjects element. 
	It is selected for execution by the <xsl:apply-templates> instruction in the above template. And it is applied only on the empty-element siblings of the fieldsToNull element. 
	This template does two things: 
	a) output a comma, if this is not the first node in the node-list; 
	b) output the name of the matched element. 
	In this way all names of the empty siblings-elements of the EmptyElements element are output separated by a comma-->
	<xsl:template match="sObjects/sObject/*" mode="enumerate">
		<xsl:value-of select="substring(',', not(position() = 1), 1)"/>
		<xsl:value-of select="name()"/>
	</xsl:template>
</xsl:stylesheet>