Well,i've enclosed the template rule which involves IF
test.


<xsl:template match="book">
	<xsl:if test="not(@ISBN)">
	    <xsl:attribute name="NOCODE">
	        <xsl:text>B01</xsl:text>
	    </xsl:attribute>
	 </xsl:if>   
</xsl:template>

The Book element has the following format
<Book NAME="book-name" AUTHOR="author-name"
ISBN="91-6637-401-7"/>



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