The <xsl:copy-of>
element makes a deep copy (including descendant nodes) of whatever the select attribute specifies to the output document.
<xsl:copy-of select=EXPRESSION />
select
None.
Instruction, appears within a template.
XSLT, section 11.3.
Supported.
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/XSLT/copy-of