XSLT 3.0 assertion and exception throwing after iteration

Question

I have XSLT module containing dependent components: iteration, validation and …

Input example port1.xml

<valuationDocument>
  <valuationSet id="val1">
    <assetValuation>
      <objectReference href="tid-1" />
      <quote>
        <value>1000000</value>
        <sensitivitySet>
          <sensitivity name="SEP21">0.707</sensitivity>
          <sensitivity name="2Y">1.82</sensitivity>
          <sensitivity name="3Y">2.73</sensitivity>
          <sensitivity name="4Y">3.68</sensitivity>
          <sensitivity name="5Y">4.51</sensitivity>
          <sensitivity name="7Y">3.64</sensitivity>
          <sensitivity name="10Y">9.06</sensitivity>
          <sensitivity name="MAR21">0.315</sensitivity>
          <sensitivity name="15Y">13.59</sensitivity>
        </sensitivitySet>
      </quote>
    </assetValuation>
    <assetValuation>
      <objectReference href="tid-2" />
      <quote>
        <value>1100000</value>
        <sensitivitySet>
          <sensitivity name="SEP21">0.947</sensitivity>
          <sensitivity name="MAR21">0.502</sensitivity>
          <sensitivity name="2Y">1.91</sensitivity>
          <sensitivity name="3Y">2.84</sensitivity>
          <sensitivity name="4Y">3.72</sensitivity>
          <sensitivity name="5Y">4.63</sensitivity>
          <sensitivity name="7Y">3.71</sensitivity>
          <sensitivity name="10Y">9.15</sensitivity>
          <sensitivity name="15Y">13.64</sensitivity>
        </sensitivitySet>
      </quote>
    </assetValuation>
  </valuationSet>
</valuationDocument>

I am quasi-satisfied with the iteration component (incapacitating the streaming…). The iteration result is below:

<valuationDocument>
   <valuationSet id="val1">
      <assetValuation>
         <objectReference href="tid-1"/>
         <quote>
            <value>1000000</value>
            <BasisPointValue>
               <shiftUp units="100bp" sensitivityName="SEP21" sensitivity="0.707">992,930.00</shiftUp>
               <shiftDown units="100bp" sensitivityName="SEP21" sensitivity="0.707">1,007,070.00</shiftDown>
==========================================================================================
               <shiftUp units="100bp" sensitivityName="15Y" sensitivity="13.59">864,100.00</shiftUp>
               <shiftDown units="100bp" sensitivityName="15Y" sensitivity="13.59">1,135,900.00</shiftDown>
            </BasisPointValue>
            <sensitivitySet>
               <sensitivity name="SEP21">0.707</sensitivity>
               <sensitivity name="2Y">1.82</sensitivity>
               <sensitivity name="3Y">2.73</sensitivity>
               <sensitivity name="4Y">3.68</sensitivity>
               <sensitivity name="5Y">4.51</sensitivity>
               <sensitivity name="7Y">3.64</sensitivity>
               <sensitivity name="10Y">9.06</sensitivity>
               <sensitivity name="MAR21">0.315</sensitivity>
               <sensitivity name="15Y">13.59</sensitivity>
            </sensitivitySet>
         </quote>
      </assetValuation>
      <assetValuation>
        <objectReference href="tid-2" />
           <quote>
              <value>1100000</value>
            <BasisPointValue>
               <shiftUp units="100bp" sensitivityName="SEP21" sensitivity="0.947">1,089,583.00</shiftUp>
               <shiftDown units="100bp" sensitivityName="SEP21" sensitivity="0.947">1,110,417.00</shiftDown>
==========================================================================================
               <shiftUp units="100bp" sensitivityName="15Y" sensitivity="13.64">949,960.00</shiftUp>
               <shiftDown units="100bp" sensitivityName="15Y" sensitivity="13.64">1,250,040.00</shiftDown>
            </BasisPointValue>
            <sensitivitySet>
               <sensitivity name="SEP21">0.947</sensitivity>
               <sensitivity name="MAR21">0.502</sensitivity>
               <sensitivity name="2Y">1.91</sensitivity>
               <sensitivity name="3Y">2.84</sensitivity>
               <sensitivity name="4Y">3.72</sensitivity>
               <sensitivity name="5Y">4.63</sensitivity>
               <sensitivity name="7Y">3.71</sensitivity>
               <sensitivity name="10Y">9.15</sensitivity>
               <sensitivity name="15Y">13.64</sensitivity>
            </sensitivitySet>
         </quote>
      </assetValuation>
   </valuationSet>
</valuationDocument>

I would like to validate the iteration result as soon as it completes. Should any of the validation fail, the exception is reported and the program is terminated. However, the validation ISN'T played out after the iteration. (The actual validation is to raise exception through xsl:try|catch and terminate if any of the assertion fails)

The validation logic is to compare three metrics of the sensitivitySet/sensitivity with those of iterated & transformed BasisPointValue/shiftUp|shiftDown/@sensitivity (NOTE: xsl:text is to simulate exception throwing, apparently, the XSLT editor can’t emit the message)

    <xsl:variable name="MinE">
        <!-- <xsl:message terminate="yes">Fatal Error: Minimum NPV and BPV sensitivity is different</xsl:message>-->
        <xsl:text>&#x9;&#xA;</xsl:text>
        <xsl:text>Retro: Min NPV and BPV sensitivity</xsl:text>
        <xsl:text>&#x9;&#xA;</xsl:text>
    </xsl:variable> 
    <xsl:variable name="MaxE">
        <!--<xsl:message terminate="yes">Fatal Error: Maximum NPV and BPV sensitivity is different</xsl:message>-->
        <xsl:text>&#x9;&#xA;</xsl:text>
        <xsl:text>Retro: Max NPV and BPV sensitivity</xsl:text>
        <xsl:text>&#x9;&#xA;</xsl:text>
    </xsl:variable> 
    <xsl:variable name="AvgDownE">
        <!--<xsl:message terminate="yes">Fatal Error: Average NPV and BPV ShiftDown sensitivity is different</xsl:message>-->
        <xsl:text>&#x9;&#xA;</xsl:text>
        <xsl:text>Retro: Average NPV and BPV ShiftDown</xsl:text>
        <xsl:text>&#x9;&#xA;</xsl:text>
    </xsl:variable>
    
    <xsl:template match="/">
        <xsl:source-document href="port1.xml">
             <xsl:apply-templates select="valuationDocument" mode="val"/>
        </xsl:source-document>
    </xsl:template>

    <xsl:template match="sensitivitySet" mode="val">

<!--  ITERATION -->     
    ==========================================
        <!--        <xsl:apply-imports/>-->
         <xsl:copy-of select="."/>
        <xsl:apply-templates select="parent::quote" mode="validation"/>
    </xsl:template>
  
<!--  VALIDATION -->
    <xsl:template match="quote" mode="validation" expand-text="yes">
        <Assertion>
             <xsl:variable name="m" as="map(*)">
                <xsl:map>
                   <xsl:map-entry key="'min-npv'" select="min(outermost(descendant::sensitivity)/number())"/>
                   <xsl:map-entry key="'max-npv'" select="max(outermost(descendant::sensitivity)/number())"/>
                   <xsl:map-entry key="'min-bpv'" select="min(outermost(descendant::BasisPointValue//@sensitivity)/number())"/>
                   <xsl:map-entry key="'max-bpv'" select="max(outermost(descendant::BasisPointValue//@sensitivity)/number())"/>
                   <xsl:map-entry key="'avg-npv'" select="avg(outermost(descendant::sensitivity)/number())"/>
                   <xsl:map-entry key="'avg-bpv-down'" select="avg(outermost(descendant::BasisPointValue/shiftDown/@sensitivity)/number())"/>
                 </xsl:map>
              </xsl:variable>
                    <xsl:choose>
                        <xsl:when test="deep-equal($m('min-npv'), $m('min-bpv'))">
                            <xsl:value-of select="$MinE"/>
                        </xsl:when>
                        <xsl:when test="deep-equal($m('max-npv'), $m('max-bpv'))">
                            <xsl:value-of select="$MaxE"/>
                        </xsl:when>
                        <xsl:when test="deep-equal($m('avg-npv'), $m('avg-bpv-down'))">
                            <xsl:value-of select="$AvgDownE"/>
                        </xsl:when>
                        <xsl:otherwise><xsl:value-of select="'Validation Succeeds!'"/></xsl:otherwise>
                    </xsl:choose>
        </Assertion> 
    </xsl:template>

What is the XSLT3.0 solution of validation after the iteration?

question from:https://stackoverflow.com/questions/65558051/xslt-3-0-assertion-and-exception-throwing-after-iteration

Answer 1

If I understand the question correctly, this is a standard multi-phase transformation. You can either use two separate stylesheets, chained together using some external API (e.g. shell script, Ant/gradle, XProc, Java application) or you can put both phases in the same stylesheet using the logic

<xsl:variable name="temp">
  <xsl:apply-templates select="/" mode="phase-1"/>
</xsl:variable>
<xsl:apply-templates select="$temp" mode="phase-2"/>