Single Space Separator in xsl:attribute

Hi all,

I try to use a single space as a separator in an xsl:attribute 
instruction where the xsl:attribute instruction contains a sequence 
constructor. Unfortunately it seems that the single space is replaced by 
an empty string.

The following stylesheet yiels an element with two attributes the value 
of the first attribute is "123" and the value of the second one is "1-2-3".

Isn't it possible to use a single space as a separator together with a 
sequence constructor?

Best regards,
--Stefan


   <xsl:template match="/">
    
     <xsl:message>
       <x>
         <xsl:attribute name="a" separator=" ">
           <xsl:sequence select="1, 2, 3"/>
         </xsl:attribute>
         <xsl:attribute name="b" separator="-">
           <xsl:sequence select="1, 2, 3"/>
         </xsl:attribute>
       </x>
     </xsl:message>
    
   </xsl:template>



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