Re: Numbering new nodes using consecutive integers

you don't need xsl:number here as you're doing all the grouping by hand
so the number you want is I think
      <xsl:attribute name="no">
         <xsl:value-of select="position()+ ceiling(count(../preceding-sibling::G1/M) div $M-per-G2) "/>
       </xsl:attribute>

David


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