RE: commenting in xslt2.0 - input-subtree to ouput-co

> is it possible to create an xml comment in the XSLT-output
> which consists of a complete subtree of the xml-input-document?
> Im using XSLT 2.0.

No, comment nodes cannot have children, so they cannot contain a subtree.
(To put it another way, angle brackets inside a comment are not markup
representing elements and attributes, they are just text.)

In Saxon you can do

<xsl:comment>
  <xsl:value-of select="saxon:serialize($subtree)"/>
</xsl:comment>

Michael Kay
http://www.saxonica.com/