Rolling sum of template result in XSL1.0 - templates

Question

I've searched far and wide for an example of this, and have so far had no luck in applying a sum template to make my XSTL work.
This is the XML (number of lines varies on each planfeature)
<PlanFeatures>
<PlanFeature name="Line0001">
<CoordGeom>
<Line>
<Start pntRef="7540">5605 8950 1020</Start>
<End pntRef="7541">5605 8951 1019</End>
</Line>
<Line>
<Start pntRef="7541">5605 8951 1019</Start>
<End pntRef="7542">5605 8947 1019</End>
</Line>
<Line>
<Start pntRef="7542">5605 8947 1019</Start>
<End pntRef="7543">5605 8940 1011</End>
</Line>
<Line>
<Start pntRef="7543">5605 8940 1011</Start>
<End pntRef="7544">5605 8931 1020</End>
</Line>
</CoordGeom>
</PlanFeature>
</PlanFeatures>
This is where I'm at with the XSL, which uses a recursive call template to calculate the distance of each line segment.
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:landxml="http://www.landxml.org/schema/LandXML-1.2" xmlns:hexagon="http://xml.hexagon.com/schema/HeXML-1.5" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" version="1.0" encoding="UTF-16" indent="no" omit-xml-declaration="yes"/>
<xsl:variable name="XML" select="/"/>
<xsl:variable name="fileExt" select="'txt'"/>
<xsl:variable name="fileDesc" select="'line distance report'"/>
<xsl:template match="/">
<xsl:for-each select="$XML">
<xsl:for-each select="landxml:LandXML/landxml:PlanFeatures/landxml:PlanFeature">
<xsl:value-of select="#name"/><xsl:text>::</xsl:text>
<xsl:for-each select="landxml:CoordGeom/landxml:Line">
<xsl:value-of select="landxml:Start/#pntRef"/><xsl:text>-</xsl:text>
<xsl:variable name="lista" select="landxml:Start"/>
<xsl:variable name="x1" select="substring-before($lista,' ')"/>
<xsl:variable name="yt1" select="substring-after($lista,' ')"/>
<xsl:variable name="y1" select="substring-before($yt1,' ')"/>
<xsl:variable name="z1" select="substring-after($yt1,' ')"/>
<xsl:variable name="listb" select="landxml:End"/>
<xsl:value-of select="landxml:End/#pntRef"/><xsl:text>: </xsl:text>
<xsl:variable name="x2" select="substring-before($listb,' ')"/>
<xsl:variable name="yt2" select="substring-after($listb,' ')"/>
<xsl:variable name="y2" select="substring-before($yt2,' ')"/>
<xsl:variable name="z2" select="substring-after($yt2,' ')"/>
<xsl:variable name="seg" select= "((($x2 - $x1)*($x2 - $x1))+(($y2 - $y1)*($y2 - $y1))+(($z2 - $z1)*($z2 - $z1)))"/>
<xsl:call-template name="root">
<xsl:with-param name="X" select="$seg"/>
</xsl:call-template>
<xsl:text>, </xsl:text>
</xsl:for-each>
<xsl:text>
</xsl:text>
</xsl:for-each>
</xsl:for-each>
</xsl:template>
<xsl:template name="root">
<xsl:param name="X"/>
<xsl:param name="xn" select="0"/>
<xsl:param name="xn_1" select="($X+1) div 2"/>
<xsl:choose>
<xsl:when test="string(number($X)) = 'NaN'">
<xsl:value-of select=" ' ' "/>
</xsl:when>
<xsl:when test="($xn_1 - $xn) * ($xn_1 - $xn) < 0.00000001">
<xsl:value-of select='format-number($xn_1, "#.000")'/>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="root">
<xsl:with-param name="X" select="$X"/>
<xsl:with-param name="xn" select="$xn_1"/>
<xsl:with-param name="xn_1" select="($xn_1 + ($X div $xn_1)) div 2"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
I need to sum the value of X (distance) from the root call template, to create a value which represents the sum of each line segment. I think I need to use a match template, but so far it hand even got close to working.
Currently exporting LINEID::StartPt-EndPt: dist, StartPt-EndPt: dist, etc. I need the sum of the 'dist' to be shown at the end of each line as well. As below
Line0001::7540-7541: 1.414, 7541-7542: 2.000, 7542-7543: 12.042, 7543-7544: 12.720
but I would like
Line0001::7540-7541: 1.414, 7541-7542: 2.000, 7542-7543: 12.042, 7543-7544: 12.728 -- 28.184
Any help would be appreciated... the examples on this site have helped me so much already, but I just can't seem to get through this roadblock.
Cheers,
Chris

Answer 1

You can accomplish this with some relatively simple recursion and parameter passing. Try replacing your first template with these four templates:
<xsl:template match="/">
<xsl:for-each select="$XML">
<xsl:apply-templates
select="landxml:LandXML/landxml:PlanFeatures/landxml:PlanFeature" />
</xsl:for-each>
</xsl:template>
<xsl:template match ="landxml:PlanFeature">
<xsl:value-of select="concat(#name, '::')" />
<xsl:apply-templates select="landxml:CoordGeom/landxml:Line[1]" />
<xsl:text>
</xsl:text>
</xsl:template>
<xsl:template match="landxml:Line">
<xsl:param name="total" select="0" />
<xsl:value-of
select="concat(landxml:Start/#pntRef, '-', landxml:End/#pntRef, ': ')"/>
<xsl:variable name="len">
<xsl:call-template name="root">
<xsl:with-param name="X">
<xsl:call-template name="seg" />
</xsl:with-param>
</xsl:call-template>
</xsl:variable>
<xsl:value-of select="$len"/>
<xsl:variable name="next" select="following-sibling::landxml:Line[1]" />
<xsl:variable name="newTot" select="$total + $len" />
<xsl:choose>
<xsl:when test="$next">
<xsl:text>, </xsl:text>
<xsl:apply-templates select="$next">
<xsl:with-param name="total" select="$newTot" />
</xsl:apply-templates>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="concat(' -- ', format-number($newTot, '#.000'))" />
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="seg">
<xsl:variable name="lista" select="landxml:Start"/>
<xsl:variable name="x1" select="substring-before($lista,' ')"/>
<xsl:variable name="yt1" select="substring-after($lista,' ')"/>
<xsl:variable name="y1" select="substring-before($yt1,' ')"/>
<xsl:variable name="z1" select="substring-after($yt1,' ')"/>
<xsl:variable name="listb" select="landxml:End"/>
<xsl:variable name="x2" select="substring-before($listb,' ')"/>
<xsl:variable name="yt2" select="substring-after($listb,' ')"/>
<xsl:variable name="y2" select="substring-before($yt2,' ')"/>
<xsl:variable name="z2" select="substring-after($yt2,' ')"/>
<xsl:value-of select= "($x2 - $x1)*($x2 - $x1)+
($y2 - $y1)*($y2 - $y1)+
($z2 - $z1)*($z2 - $z1)"/>
</xsl:template>
When run on your sample input (after adjusting it to match the paths in your XSLT), the result is:
Line0001::7540-7541: 1.414, 7541-7542: 4.000, 7542-7543: 10.630, 7543-7544: 12.728 -- 28.772