checking for element in CDATA

Hallo everyone,
I have write a xsl to check if there is an element
present in CDATA, how to do this.
Here is an example
<element name="ArticleHistory">
   <example><![CDATA[<ArticleHistory>
      <RegistrationYear>2001</RegistrationYear>
      <Received>
         <Year>1999</Year>
         <Month>9</Month>
         <Day>7</Day>
       </Received>
   </ArticleHistory>]]>
  </example>
</element>

so here I have to check if <ArticleHistory> is present
inside CDATA.
How to do this?
Thanx,
Sri


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