Look at http://zvon.vscht.cz/HTMLonly/XSLTutorial/Books/Book1/index.html
example 22

"Martin Rothschink, AxoNet Software" wrote:
> 
> Hi,
> I started using XSL and run into my first problem.
> 
> I have a XML file like this:
> 
> <SECTION>
>         <DATA>...</DATA>
>         <DATA>...</DATA>
>         <SUMMARY>..<SUMMARY>
> </SECTION
> <SECTION>
>         <DATA>...</DATA>
>         <DATA>...</DATA>
> </SECTION
> 
> If there's no summary I want to output all <DATA> elements of a <SECTIONS>
> but if the summary is present I only want to output the <SUMMARY>:
> 
> <SECTION>
>         <SUMMARY>..<SUMMARY>
> </SECTION
> <SECTION>
>         <DATA>...</DATA>
>         <DATA>...</DATA>
> </SECTION
> 
> Any help appreciated
> Martin Rothschink
> 
> AxoNet Software GmbH
> Osianderstr. 2/1, 73230 Kirchheim unter Teck, Germany
> Tel +49 (7021) 735 600, Fax +49 (7021) 735 601
> mailto:Martin.Rothschink@xxxxxxxxx, Web http://www.axonet.de
> 
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

-- 
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Dr. Miloslav Nic                        e-mail: nicmila@xxxxxxxx
Department of Organic Chemistry         TEL: +420 2 2435 5012  
ICT Prague (VSCHT Praha)                     +420 2 2435 4118
    				        FAX: +420 2 2435 4288  
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 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list