I'm trying to get the last item in a group (but gettin

Using XSLT 2, I'm trying to read through a list of books that I keep
in XML.  I want to get
the last book that I've read in each series.

I tried to use XML groups and get the last() item, but it's not
working as I expected: it always comes up as the first book in the
series.

What I'm a going wrong?

As an aside, I eventually also want to look through the books for
missing books (starting with 1 and ignoring any series with a
non-integer number, like "3.5" -- which I use to represent a short
story that comes in the storyline at that point.)  NOTE: Since I could
not get the last number in the series, I have not even attempted this
in the XSLT file yet.

I've included some sample files at the end of the text: text.xml (the
input) and toread.xsl (the XSLT).

This is the command I'm using:

java -jar saxon9he.jar -s test.xml -o toread.txt toread.xsl

I've included the received output (toread.txt) and the expected output
(toread-expected.txt).

Any pointers appreciated.   Thanks.

Files (preceded by '***** FILENAME')

***** text.xml
<?xml version="1.0" encoding='utf-8'?>
<?oxygen RNGSchema="schema/books.rnc" type="compact"?>
<booklist owner="Kevin Grover" cre-date="1991-01-05" mod-date="2010-04-04">

<author>
  <name file-as="Adams, Douglas">Douglas Adams</name>

  <book>
    <title>Hitchhiker's Guide to the Galaxy</title>
    <date>1980</date>
    <owner>KOG</owner>
    <date-read>1984</date-read>
    <date-read>1999-06</date-read>
    <genre>Comedy</genre>
    <genre>SciFi</genre>
    <type>book/paperback</type>
    <series title="Hitchhiker Series" number="1" />
    <comment>Funny!</comment>
  </book>

  <book>
    <title>The Restaurant at the End of the Universe</title>
    <date>1980</date>
    <owner>KOG</owner>
    <date-read>1984</date-read>
    <genre>Comedy</genre>
    <genre>SciFi</genre>
    <series title="Hitchhiker Series" number="2" />
    <comment>Funny!</comment>
  </book>

  <book>
    <title>Life, the Universe and Everything</title>
    <date>1982</date>
    <owner>KOG</owner>
    <date-read>1984</date-read>
    <genre>Comedy</genre>
    <genre>SciFi</genre>
    <series title="Hitchhiker Series" number="3" />
    <comment>Funny!</comment>
  </book>

  <book>
    <title>So Long and Thanks for all the Fish</title>
    <date>1999</date>
    <owner>KOG</owner>
    <date-read>1999</date-read>
    <genre>Comedy</genre>
    <genre>SciFi</genre>
    <isbn>0-345-39183-7</isbn>
    <series title="Hitchhiker Series" number="4" />
  </book>

</author>

<author>
  <name file-as="Anderson, Kevin J.">Kevin J. Anderson</name>
  <book>
    <title>Identity Crisis</title>
    <date>2000</date>
    <owner>FWS</owner>
    <date-read>2002-03</date-read>
    <genre>SciFi</genre>
    <comment>Good.  Downloaded from Fictionwise.com</comment>
  </book>

  <book>
    <title>Hopscotch</title>
    <date>2003</date>
    <owner>GET</owner>
    <genre>SciFi</genre>
    <comment>Elaboration of 'Identity Crisis' theme: personality
transference.</comment>
  </book>

</author>

<author>
  <name file-as="Anthony, Piers">Piers Anthony</name>

  <book>
    <title>The Source of Magic</title>
    <date>1979</date>
    <owner>KOG</owner>
    <date-read>1988</date-read>
    <genre>Fantasy</genre>
    <type>book/paperback</type>
    <series title="The Magic of Xanth" number="2" />
  </book>

  <book>
    <title>Castle Roogna</title>
    <date>1979</date>
    <owner>KOG</owner>
    <date-read>1988</date-read>
    <genre>Fantasy</genre>
    <type>book/paperback</type>
    <series title="The Magic of Xanth" number="3" />
  </book>

  <book>
    <title>Ogre, Ogre</title>
    <date>1982</date>
    <owner>KOG</owner>
    <date-read>1988</date-read>
    <genre>Fantasy</genre>
    <type>book/paperback</type>
    <series title="The Magic of Xanth" number="5" />
  </book>

  <book>
    <title>Night Mare</title>
    <date>1982</date>
    <owner>KOG</owner>
    <date-read>1988</date-read>
    <genre>Fantasy</genre>
    <type>book/paperback</type>
    <series title="The Magic of Xanth" number="6" />
  </book>

</author>

</booklist>

<!--
Local Variables:
mode: nxml
mode: auto-fill
mode: flyspell
End:
-->

***** toread.xsl
<?xml version="1.0"?>

<!-- from article: http://www.xml.com/pub/a/2003/11/05/tr.html -->

<xsl:stylesheet
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   version="2.0">

  <xsl:output method="text"/>

  <!-- ********************************************* -->

  <xsl:template match="/">
    <xsl:text>Last books read in each series.

</xsl:text>
    <!-- TODO: Add date(file), date(current), vcsversion, ..? -->
    <xsl:apply-templates select="/booklist/author"/>
  </xsl:template>

  <!-- ********************************************* -->

  <xsl:template match="author">
     <xsl:for-each-group
	select="book[series and date-read]"
	group-by="series/@title">
      <xsl:text>
-------------------------------------------------------
</xsl:text>
      <xsl:text>Series: </xsl:text>
      <xsl:value-of select="current-grouping-key()"/>
      <xsl:text>; Author: </xsl:text>
      <xsl:value-of select="../name/text()"/>
      <xsl:text>
</xsl:text>
      <!-- Last book in series -->
      <!-- TODO: this is incorrect, it's the first book in the series -->
      <xsl:text>Last Book Read: </xsl:text>
      <xsl:value-of select=".[last()]/title"/>
      <xsl:text>, #</xsl:text>
      <!-- Number in series -->
      <!-- TODO: This is incorrect, it always 1 -->
      <xsl:value-of select=".[last()]/series/@number"/>
      <!-- TODO: if there are missing books in the series, put them here.
                 e.g. if I read 3-6 then last read is 6 and missing are
                 1 and 2 -->
      <xsl:text>
</xsl:text>
    </xsl:for-each-group>
  </xsl:template>

</xsl:stylesheet>

***** toread.txt
Last books read in each series.


-------------------------------------------------------
Series: Hitchhiker Series; Author: Douglas Adams
Last Book Read: Hitchhiker's Guide to the Galaxy, #1

-------------------------------------------------------
Series: The Magic of Xanth; Author: Piers Anthony
Last Book Read: A Spell for Chameleon, #1

***** toread-expected.txt
Last books read in each series.


-------------------------------------------------------
Series: Hitchhiker Series; Author: Douglas Adams
Last Book Read: So Long and Thanks for all the Fish, #4

-------------------------------------------------------
Series: The Magic of Xanth; Author: Piers Anthony
Last Book Read: Night Mare, #6

Missing: #1, #4