[xsl] Template matching preceding-sibling.

I'm missing something fundamental, what is it?

<xsl:template match="Rec[activity != preceding-sibling::Rec/activity
or not(preceding-sibling::Rec)]">
  Ello xslers.
</xsl:template>

<xml>
   <Rec>
     <activity>hi</activity>
   </Rec>
   <Rec>
      <activity>hi</activity>
   </Rec>
</xml>

----

Above should only print anything once, but I'm getting it each time.
What am I not getting?

-Steve

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