<xsl:choose> and normalization of timestamp

[Matej Cepl <mcepl@redhat.com>]

Hi,

trying to normalize timestamp while generating atom feed from 
docbook. Some timestamps in my document include time (not only 
date), other don’t. So, I have created this construct to 
normalize them.

    <xsl:variable name="datestr"><xsl:value-of
        select="d:info/d:date"/></xsl:variable>
    <xsl:message><xsl:value-of
            select="d:info/d:date"/></xsl:message>
    <xsl:variable name="datevalue"><xsl:choose><xsl:when
        test="contains('d:info/d:date','T')"><xsl:value-of
        select="$datestr"/></xsl:when>
        <xsl:otherwise><xsl:value-of
                select="concat($datestr,'T00:00:00')"/></xsl:otherwise>
    </xsl:choose>
    </xsl:variable>
    <xsl:message>datevalue=<xsl:value-of select="$datevalue"/></xsl:message>

However, it doesn't seem to work:

[matej@viklef duchnik]$ xsltproc -o duchnik.atom atom.xsl duchnik.tdb
2008-07-05
datevalue=2008-07-05T00:00:00
2007-02-20T09:25+01:00
datevalue=2007-02-20T09:25+01:00T00:00:00
2006-02-18
datevalue=2006-02-18T00:00:00
2006-02-03
datevalue=2006-02-03T00:00:00
[matej@viklef duchnik]$ 

The value which originally already had a time value, is added another one. What
I do wrong?

Thanks for any help,

Matěj