Re: Re: Keeping a running total?

<xml>
<factory x="A" capacity = "3" />
<factory x="B" capacity= "5" />
 <factory x="C" capacity = "3" />
 <factory x="D" capacity = "2" />
 <factory x="E" capacity = "2" />
 ...etc...
</xml>

<xsl:template match="xml">
   <xsl:apply-templates select="factory">
       <xsl:with-param name="leftW" select="$Widget_quota" />
       <xsl:with-param name="leftG" select="$Gadget_quota" />
   <xsl:apply-templates select="factory">
</xsl:template>

<xsl:template match="factory">
   <!-- running totals of capacity already used   -->
       <xsl:param name="used">0</xsl:param>
       <xsl:param name="usedW">0</xsl:param>
       <xsl:param name="usedG">0</xsl:param>
   <!-- running totals of quota not used   -->
       <xsl:param name="leftW">0</xsl:param>
       <xsl:param name="leftG">0</xsl:param>

   <xsl:otherwise>
               <xsl:apply-templates select=".">
                   <xsl:with-param name="used" select="@capacity" />
                   <xsl:with-param name="usedW" select="$usedW" />
                   <xsl:with-param name="usedG"  select="$usedG" />
               </xsl:apply-templates>
   </xsl:otherwise>

   </xsl:choose>
</xsl:template>

This is one possible solution, however it's time complexity is O(N^2)
and can be unacceptable for producing intermediate results from an
operation over a list of N items.

A recursive solution (such as using the FXSL scanl()
template/function) can have a O(N) complexity.