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Getting unique items from elements

Subject: Getting unique items from elements
From: "Guy" <guy@xxxxxxxxxxx>
Date: Tue, 14 Nov 2006 11:41:55 -0500
unique items for kids
I have the following snippet of XML:

    <title>Mary Poppins</title>
    <title>Los Perdidos</title>

Which I currently (and erroneously) transform using:

  <xsl:template match="/">
      <xsl:for-each select="books/book/category">
        <xsl:value-of select="."/>,

The output as you would expect includes the category of "Children" twice. Is
there a way in XSL to extract only the unique elements from <category>?

Thank you!

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