Hi Richard,



Kerry, Richard wrote:
[...]
Since I wrote the above I've received George's solution for problem 3,

which I don't yet understand.  




 <one:one xmlns:one="http://www.example.com/one" index="1"/>



Adds an element in a namespace different than the XSLT namespace, just 
to be selected by the variable below.



 <xsl:variable name="one" select="document('')/*/one:one" 
xmlns:one="http://www.example.com/one"/>



The one variable points to the one:one element above, I need that below 
to get the default value 1 in case no previous index is found.



 <xsl:template match="incoming">



We are on an incoming element.



  <xsl:choose>
   <xsl:when test="@index">

If that specifies an index then we just use it.



    <ougoing name="{@name}" index="{@index}"/>
   </xsl:when>
   <xsl:otherwise>

otherwise we count



    <outgoing name="{@name}" index="{count(preceding-sibling::*) +



preceding siblings



     (preceding-sibling::*[@index][1]/@index|$one/@index)[1] -

the index value of the first preceding sibling that has an index 
attribute or, if there is no preceding sibling with an index attribute 
we use the index from the one variable, that means the value 1



     count(preceding-sibling::*[@index][1]/preceding-sibling::*)



and we remove the preceding elements after the first element that has an 
index as we added all the preceding elements in the first count above



     }"/>







   </xsl:otherwise>
  </xsl:choose>

For a large number of elements you may end out of stack with a recursive 
approach unless the processor optimizes that.



In case you are not using XSLT 2.0 then you need to solve
(@size, 1)[1]
from Mike's code with something like the one:one approach from my example:

 <one:one xmlns:one="http://www.example.com/one">1</one:one>

 <xsl:variable name="one" select="document('')/*/one:one" 
xmlns:one="http://www.example.com/one"/>




 <xsl:template match="incoming">

  <xsl:param name="total-so-far"/>

  <xsl:variable name="new-total" select="$total-so-far + (@size | 
$one)[1]"/>;

  <outgoing name="{@name}" index="{$new-total}"/>

  <xsl:apply-templates select="following-sibling::incoming[1]">

   <xsl:with-param name="total-so-far" select="$new-total"/>

  </xsl:apply-templates>

 </xsl:template>



Best Regards,
George
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