I am somewhat new to XSLT, and I have a situation where depending on certain conditions I want to convert XML like:

<SomeElement>
<ChildElement/>
<ChildElement/>
<ChildElement/>
...
</SomeElement>

to:

<SomeElement value="something">
<ChildElement/>
<ChildElement/>
<ChildElement/>
...
</SomeElement>


I don't want to specify the child elements in the template that modifies the element, as these may change.

What kind of template with perform this type of transformation?

Using this input document.

<SomeElement>
	<ChildElement/>
	<ChildElement/>
	<ChildElement/>
</SomeElement>

This transformation produces the result you want.

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

	<xsl:template match="@*|node()">
		<xsl:copy>
			<xsl:apply-templates select="@*"/>
			<xsl:apply-templates/>
		</xsl:copy>
	</xsl:template>

	<xsl:template match="SomeElement">
		<xsl:copy>
			<xsl:attribute name="value">
				<xsl:value-of select="'something'"/>
			</xsl:attribute>
			<xsl:apply-templates select="@*"/>
			<xsl:apply-templates select="node()"/>
		</xsl:copy>
	</xsl:template>
</xsl:stylesheet>

The first template is the "identity" template. It takes your input document and copies it completely. The second template is the template for the "SomeElement" element. Once I match on that, I copy the element itself, then create an attribute with a text value of 'something'. Then I apply the identity template on all the children/attributes of SomeElement to produce the rest of the tree.

Result

<SomeElement value="something">
	<ChildElement/>
	<ChildElement/>
	<ChildElement/>
</SomeElement>
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