duplicate problem..

I'm looping across:
  <Chapter_group>
    <Chapter id="7" isbn="0-324-12175" name="Data And
Statistics" original_number="0" page_count="25" />
    <Chapter id="8" isbn="0-324-12175" name="Data And
Statistics" original_number="1" page_count="25" />
    <Chapter id="9" isbn="0-324-12175"
name="Descriptive Statistics: Tabular And Graphical
Methods" original_number="2" page_count="53" />
 </Chapter_group>

with this:
	<xsl:variable name="unique-chapter-name-list"
select="//Chapter_group/Chapter[not(./@name =
following::./@name)]"/>


it's still showing them all  regardless of whether the
next @name is the same as the previous one.

Any help greatly appreciated.

thanks
paul


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