Differences in specifying variable value

http://zvon.vscht.cz/HTMLonly/XSLTutorial/Books/Book1/index.html
example 82

>.... is not solved in your book. The situation is:
> 
> 
>         <xsl:template>
> 
>               <xsl:call-template name = "func">
> 
>                   <xsl:with-param name =
> "param1">element1/element2</xsl:with-param>
> 
>               </xsl:call-template>
> 
>         </xsl:template>
> 
> 
>         <xsl:template name = "func">
> 
>               <xsl:param name = "$param1">
>         ...............
> 
>               <xsl:for-each select = "$param1">
>                   ....
>                   <xsl:for-each>
> 
>         ...............
> 
>         <xsl:template>
> 
> 
>         I have a problem that XT doesn't accept the selected string
> saying that it can't convert string to node-set.
>
***************************************************************
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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