> If it wasn't a typo I think it should be
> 
> 	<xsl:value-of select = "format-number(@zne, '00')"/>
> 
> single quote for the function parameter and double quote for 
> the attribute value

Wrong, it's quite OK to use single quotes for the attribute and double
quotes for the string literal.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx 


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