The <xsl:comment>
element writes a comment to the output document. It must include only text.
<xsl:comment> TEMPLATE </xsl:comment>
None.
None.
Instruction, appears within a template.
XSLT, section 7.4.
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/comment