The <xsl:copy-of> element makes a deep copy (including descendant nodes) of whatever the select attribute specifies to the output document.
Syntax
<xsl:copy-of select=EXPRESSION />
Required Attributes
select- Uses an XPath expression that specifies what is to be copied.
Optional Attributes
None.
Type
Instruction, appears within a template.
Defined
XSLT, section 11.3.
Gecko support
Supported.