website xsl: summary, author etc in head.xsl

Hello All,

have been creating my website with heavily modified website  xsl (241) 
and just now noticed a lot of  empty templates in head.xsl:
<head.xsl>
<xsl:template match="copyright" mode="head.mode">  <!--nop--></xsl:template>
<xsl:template match="author" mode="head.mode">  <!--nop--></xsl:template>
<xsl:template match="edition" mode="head.mode">  <!--nop--></xsl:template>
</head.xsl>

does that mean that nobody had time to do something with these 
templates? I suppose they could be used to create usable metatags.

The site is at www.kuilder.net, relies heavily on css and on my 
preferences for the general layout for a website.

REgards,

Gerrit Kuilder

-- 
Jeg holder p廛keferie hele ugen.
Med venlig hilsen

Gerrit Kuilder