xsl:comment element can appear anywhere within an
xsl:template. It indicates
text that is to be output to the current output stream in the form of an XML or HTML
The content of the comment may be given either by a
select attribute or by an enclosed
sequence constructor. If the
select attribute is used and the value is a sequence, then
the items in the sequence are output space-separated.
Note that special characters occurring within the comment text will not be escaped.