[xsl] [XSL]Display Different Results Based on Count of Node Sets

Hi,

  Below are two templates I am using to display some titles of the 
book. I am wondering if anybody knows whether or not I can use the 
count function here so that  for books with multiple books by one 
author, the titles would be broken off with the <p> tag, but those with 
only one, would not display the <p> tag. Anyone know if I should use 
<xsl:if> or the count function here?
Here is the XSLT:

   <xsl:template match="book">
       <p>
           <xsl:call-template name="author"/>
           <xsl:apply-templates/>
       </p>
   </xsl:template>

    <xsl:template match="title">
       <p>
                       <xsl:apply-templates/>
       </p>
   </xsl:template>

The XML:

   <book>
    <author>Tennison, Jeni</author>
   <title>Beginning XSLT</title>
   <title>Beginning XSLT 2.0</title>
   </book>

   <book>
   <author>Meyer, Eric</author>
   <title>The Zen of CSS</title>
   </book>

Thanks to those who may be able to help.

Alice


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