> Just to speculate some more, I guess you have something like this:
> 
> <xsl:variable name="vCityStateZip">
>   <xsl:value-of select="city"/>
>   <xsl:value-of select="state"/>
>   <xsl:value-of select="zip"/>
> </xsl:variable>
> 
> and you really want:
> 
> <xsl:variable name="vCityStateZip" as="xs:string">
>   <xsl:value-of>
>     <xsl:value-of select="city"/>
>     <xsl:value-of select="state"/>
>     <xsl:value-of select="zip"/>
>   </xsl:value-of>
> </xsl:variable>
> 
> The former is sequence of several items, the latter is a 
> sequence of one item.

Actually, the former is a single item: a document node. An xsl:variable with
child instructions and no "as" attribute always produces a document node.

But IIRC there were reports that an early version of the Altova XSLT 2.0
processor got this wrong.

Michael Kay
http://www.saxonica.com/