RE: Positional grouping with exceptions

Try

<xsl:template match="book">
  <book>
    <xsl:for-each-group select="*"
      group-starting-with="self::a[not(child::text())] | 
                           self::a[not(preceding-sibling::*[1][self::a])] | 
                           *[not(self::a)]">
      <xsl:choose>
        <xsl:when test="self::a[not(child::text())]">
          <a1><xsl:copy-of select="remove(current-group(),1)"/></a1>
        </xsl:when>
        <xsl:when test="self::a">
          <a1><xsl:copy-of select="current-group()"/></a1>
        </xsl:when>
        <xsl:otherwise> 
          <xsl:copy-of select="current-group()"/>

Not tested.

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

> -----Original Message-----
> From: Fredrik Geers [mailto:fredrik@xxxxxxxxxx] 
> Sent: 20 December 2006 14:48
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Positional grouping with exceptions
> 
> I have the following xml:
>  
> <book>
>   <header>title</header>
>   <a>text</a>
>   <a>text</a>
>   <otherelement>title</otherelement>
>   <a>text</a>
>   <a>text</a>
>   <a/>
>   <a>text</a>
> </book>
>  
> I want to group each block of consecutive <a> tags inside an 
> <al> tag, like this:
>  
> <book>
>   <header>title</header>
>   <al>
>     <a>text</a>
>     <a>text</a>
>   </al>
>   <otherelement>title</otherelement>
>   <al>
>     <a>text</a>
>     <a>text</a>
>   </al>
>   <al>
>     <a>text</a>
>   </al>
> </book>
> 
> And like you can see in the example, I want to start a new 
> <al> block when an empty <a> tag is found. That's the hard 
> part. Well, the other part also isn't that easy...
> 
> I can't use the technique described on
> http://www.dpawson.co.uk/xsl/sect2/N4486.html#d5280e424, 
> because the <a> nodes are not always preceded by an element 
> that marks a new group.
> 
> What would be the best technique to solve this? I'm using 
> Saxon 8.7.1 and XSLT 2.0.
> 
> --
> Fredrik Geers