for-each xsltree not on the same level node - xslt

Question

I have the following xml tree:
<cashflows>
<interestFlows>
<interestPaymentPeriod>
<calculationPeriod>
<startDate>20230102</startDate>
<endDate>20230130</endDate>
</calculationPeriod>
</interestPaymentPeriod>
<interestPaymentPeriod>
<calculationPeriod>
<startDate>20230202</startDate>
<endDate>20230228</endDate>
</calculationPeriod>
</interestPaymentPeriod>
<interestPaymentPeriod>
<calculationPeriod>
<startDate>20230301</startDate>
<endDate>20230330</endDate>
</calculationPeriod>
</interestPaymentPeriod>
</interestFlows>
<capitalFlows>
<flow>
<flowSubType>AMO<flowSubType>
<date>20230116<date>
</flow>
<flow>
<flowSubType>AMO<flowSubType>
<date>20230116<date>
</flow>
<flow>
<flowSubType>INT<flowSubType>
<date>20230116<date>
</flow>
</capitalFlows>
</cashflows>
For each flow[flowSubType = 'AMO'] then divide the corresponding section of InterestpaymentPeriod/calculationPeriod into two blocks.
If the AMO date falls inside an interestpayment period then divide its corresponding calculation period into two block like:
[startDate ; AMO date] and [AMO date ; endDate].
The desired output would be:
<cashflows>
<interestFlows>
<interestPaymentPeriod>
<calculationPeriod>
<startDate>20230102</startDate>
<endDate>20230116</endDate>
</calculationPeriod>
<calculationPeriod>
<startDate>20230116</startDate>
<endDate>20230130</endDate>
</calculationPeriod>
</interestPaymentPeriod>
<interestPaymentPeriod>
<calculationPeriod>
<startDate>20230202</startDate>
<endDate>20230220</endDate>
</calculationPeriod>
<calculationPeriod>
<startDate>20230220</startDate>
<endDate>20230228</endDate>
</calculationPeriod>
</interestPaymentPeriod>
<interestPaymentPeriod>
<calculationPeriod>
<startDate>20230301</startDate>
<endDate>20230330</endDate>
</calculationPeriod>
</interestPaymentPeriod>
</interestFlows>
<capitalFlows>
<flow>
<flowSubType>AMO<flowSubType>
<date>20230116<date>
</flow>
<flow>
<flowSubType>AMO<flowSubType>
<date>20230220<date>
</flow>
<flow>
<flowSubType>INT<flowSubType>
<date>20230116<date>
</flow>
</capitalFlows>
</cashflows>
I have tried the followwing:
<xsl:template match="interestPaymentPeriod/calculationPeriod">
<xsl:variable name="found" select="'false'"></xsl:variable>
<xsl:variable name="pos" select="0"></xsl:variable>
<xsl:variable name="amortizingDate" select="''"></xsl:variable>
<xsl:variable name="position" select="0"></xsl:variable>
<xsl:variable name="path" select="../../../capitalFlows/flow" />
<xsl:for-each select="$path">
<xsl:variable name="pos" select="$pos + 1"></xsl:variable>
<xsl:if test="calculationStartDate < (../../../capitalFlows/flow[position()=$pos and flowSubType = 'AMO']/exdividendDate) and (../../../capitalFlows/flow[position()=$pos and flowSubType = 'AMO']/exdividendDate) < calculationEndDate ">
<xsl:variable name="found" select="'true'"></xsl:variable>
<xsl:variable name="position" select="$pos"></xsl:variable>
</xsl:if>
<xsl:if test="calculationStartDate < (../../../capitalFlows/flow[flowSubType = 'AMO']/exdividendDate) and (../../../capitalFlows/flow[flowSubType = 'AMO']/exdividendDate) < calculationEndDate ">
<xsl:variable name="found" select="'false'"></xsl:variable>
</xsl:if>
</xsl:for-each>
.....
But it seems that the section for-each select="../../../capitalflows/flow" does not seem to work as it did not even go inside the loop at all.
For info, the variable $path returns 3 (the total number of flow/ nodes) which is correct. So the path is correct. But somehow passing it through a for-each loop does not behave as expected as I am never getting inside the loop.
Any idea please ?

Answer 1

AFAICT you want to do:
XSLT 2.0
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<!-- identity transform -->
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="calculationPeriod">
<xsl:variable name="amo" select="/cashflows/capitalFlows/flow[flowSubType='AMO'][current()/startDate le date and date le current()/endDate]" />
<xsl:choose>
<xsl:when test="$amo">
<calculationPeriod>
<xsl:copy-of select="startDate"/>
<endDate>
<xsl:value-of select="$amo/date"/>
</endDate>
</calculationPeriod>
<calculationPeriod>
<startDate>
<xsl:value-of select="$amo/date"/>
</startDate>
<xsl:copy-of select="endDate"/>
</calculationPeriod>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="."/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
But the result in your example is different from what you show (even after fixing your input to be a well-formed XML).
Note that this assumes that for each calculationPeriod there can be at most one flow with intersecting date.