> I want to have my XSL stylesheet evaluate to see if a tag 
> exists or the value is blank. How do I do this using <xsl:if> or
<xsl:when> ?
> 
To test if the element exists:

<xsl:template match="book">
<xsl:if test="author">

To test if the element exists and is non-empty:

<xsl:template match="book">
<xsl:if test="string(author)">

Mike Kay


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list