Finding Nodes That Match Distinct Node Value

Hi:

I want to loop through an xml document and get distinct values from an
attribute and then find all sibling nodes that have that attribute
value.

I'm pulling distinct festivals based on @festival within each artist
just fine, but then I want to go back and get all of the Artist info per
festival. It seems like the code I'm using to do this should work, but
it doesn't. I can't change the organization of the xml. I'm trying not
to use keys. I only have access to XSL 1.0 for this project. The line I
need help with is:
<xsl:for-each select="//Artist[@festival = .]">

I'm guessing that the value of "." is lost because I'm beginning at the
top of the document again. I'm certain that one of you has an elegant
solution.

XML fragment (url's removed on purpose):

<?xml version="1.0" encoding="utf-8" ?>
<Festival>
  <Artist festival="2007" name="John Doe">
    <Url>http://...</Url>
    <Date>08/17/07</Date>
    <Stage>Stage Two</Stage>
  </Artist>
  <Artist festival="2007" name="Jane Doe">
    <Url>http://...</Url>
    <Date>08/15/07</Date>
    <Stage>Stage Three</Stage>
  </Artist>
  <Artist festival="2007" name="Dick Doe">
    <Url>http://...</Url>
    <Date>08/16/07</Date>
    <Stage>Stage One</Stage>
  </Artist>
  <Artist festival="2006" name="Sally Doe">
    <Url>http://...</Url>
    <Date>08/16/06</Date>
    <Stage>Stage Four</Stage>
  </Artist>
  <Artist festival="2006" name="John Q. Public">
    <Url>http://...</Url>
    <Date>08/15/06</Date>
    <Stage>Stage One</Stage>
  </Artist>
  <Artist festival="2005" name="John Smith">
    <Url>http://...</Url>
    <Date>08/17/05</Date>
    <Stage>Stage Three</Stage>
  </Artist>
  <Artist festival="2004" name="Jane Smith">
    <Url>http://...</Url>
    <Date>08/17/04</Date>
    <Stage>Stage Four</Stage>
  </Artist>
  <Artist festival="2004" name="Sally Smith">
    <Url>http://...</Url>
    <Date>08/16/04</Date>
    <Stage>Somethin' Else</Stage>
  </Artist>
  <Artist festival="2004" name="Dick Smith">
    <Url>http://...</Url>
    <Date>08/16/04</Date>
    <Stage>Stage Two</Stage>
  </Artist>
</Festival>

Code Excerpt:

<table align="center" border="0" cellpadding="3" cellspacing="1">
   <tr align="left" valign="top">
      <td>artist</td>
      <td>date</td>
      <td>stage</td>
   </tr>
   <xsl:for-each
select="//Artist/@festival[not(.=preceding::Artist/@festival)]">
      <tr>
         <td colspan="3">
            <a name="{.}"></a>
            <xsl:choose>
               <xsl:when test=". = '2007'">
                  2 0 0 7&#160;&#8226;&#160;<a href="#2006">2 0 0
6</a>&#160;&#8226;&#160;<a href="#2005">2 0 0 5</a>&#160;&#8226;&#160;<a
href="#2004">2 0 0 4</a><br />
               </xsl:when>
               <xsl:when test=". = '2006'">
                  <a href="#2007">2 0 0 7</a>&#160;&#8226;&#160;2 0 0
6&#160;&#8226;&#160;<a href="#2005">2 0 0 5</a>&#160;&#8226;&#160;<a
href="#2004">2 0 0 4</a><br />
               </xsl:when>
               <xsl:when test=". = '2005'">
                  <a href="#2007">2 0 0 7</a>&#160;&#8226;&#160;<a
href="#2006">2 0 0 6</a>&#160;&#8226;&#160;2 0 0 5&#160;&#8226;&#160;<a
href="#2004">2 0 0 4</a><br />
               </xsl:when>
               <xsl:when test=". = '2004'">
                  <a href="#2007">2 0 0 7</a>&#160;&#8226;&#160;<a
href="#2006">2 0 0 6</a>&#160;&#8226;&#160;<a href="#2005">2 0 0
5</a>&#160;&#8226;&#160;2 0 0 4<br />
               </xsl:when>
               <xsl:otherwise>
                  <a href="#2007">2 0 0 7</a>&#160;&#8226;&#160;<a
href="#2006">2 0 0 6</a>&#160;&#8226;&#160;<a href="#2005">2 0 0
5</a>&#160;&#8226;&#160;<a href="#2004">2 0 0 4</a><br />
               </xsl:otherwise>
            </xsl:choose>
         </td>
      </tr>
      <xsl:for-each select="//Artist[@festival = .]">
         <tr>
            <td><a href="{Url}"><xsl:value-of select="@name" /></a></td>
            <td><xsl:value-of select="Date" /></td>
            <td><xsl:value-of select="Stage" /></td>
         </tr>
      </xsl:for-each>
   </xsl:for-each>
</table>

Thank you so much in advance,
Trish