> Here's something to get you started:

One comment on this
>    <xsl:for-each select="1 to 365">
>      <xsl:variable name="days"
>         select="xs:dayTimeDuration(concat('P',.,'D'))"/>
>      <xsl:sequence select="$start-date + $days"/>
>    </xsl:for-each>

I would probably write

<xsl:for-each select="1 to 365">
  <xs:sequence select="$start-date + .*$ONE_DAY"/>
</xsl:for-each>

with

<xsl:variable name="ONE_DAY" select="xs:dayTimeDuration('P1D')"/>

Regards,

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