How to compare a single value to an array using XSLT - xslt-2.0

Question

I want to compare a single value if it's existing to an array. I have an XML input file:
<wd:Report_Entry
xmlns:wd="urn:com.workday.report/CRI_-_INTSG031_CM_011_-_PUBBS_HSA_Customer_Invoice">
<wd:CFI_ARI_PUBBS_HSA_group>
<wd:pubbsType>1</wd:pubbsType>
<wd:pubbsService>A+</wd:pubbsService>
<wd:validFrom>2019-08-01</wd:validFrom>
<wd:validTo>2100-01-01</wd:validTo>
<wd:CF_FD_PUBBS_HSA_Valid_From_Date>2019-08-01</wd:CF_FD_PUBBS_HSA_Valid_From_Date>
<wd:CF_FD_PUBBS_HSA_Valid_To_Date>2100-01-01</wd:CF_FD_PUBBS_HSA_Valid_To_Date>
</wd:CFI_ARI_PUBBS_HSA_group>
<wd:CFI_ARI_PUBBS_HSA_group>
<wd:pubbsType>1</wd:pubbsType>
<wd:pubbsService>A-</wd:pubbsService>
<wd:validFrom>2019-08-01</wd:validFrom>
<wd:validTo>2100-01-01</wd:validTo>
<wd:CF_FD_PUBBS_HSA_Valid_From_Date>2019-08-01</wd:CF_FD_PUBBS_HSA_Valid_From_Date>
<wd:CF_FD_PUBBS_HSA_Valid_To_Date>2100-01-01</wd:CF_FD_PUBBS_HSA_Valid_To_Date>
</wd:CFI_ARI_PUBBS_HSA_group>
<wd:CFI_ARI_PUBBS_HSA_group>
<wd:pubbsType>FMDAUTOPSY</wd:pubbsType>
<wd:pubbsService>FMDAUTOPSY</wd:pubbsService>
<wd:validFrom>2020-02-02</wd:validFrom>
<wd:validTo>2020-02-01</wd:validTo>
<wd:CF_FD_PUBBS_HSA_Valid_From_Date>2020-02-01</wd:CF_FD_PUBBS_HSA_Valid_From_Date>
<wd:CF_FD_PUBBS_HSA_Valid_To_Date>2100-01-01</wd:CF_FD_PUBBS_HSA_Valid_To_Date>
</wd:CFI_ARI_PUBBS_HSA_group>
<wd:CFI_ARI_PUBBS_HSA_group>
<wd:pubbsType>FMDBODYSTOR</wd:pubbsType>
<wd:pubbsService>FMDBODYSTOR</wd:pubbsService>
<wd:validFrom>2020-01-01</wd:validFrom>
<wd:validTo>2020-01-31</wd:validTo>
<wd:CF_FD_PUBBS_HSA_Valid_From_Date>2020-01-01</wd:CF_FD_PUBBS_HSA_Valid_From_Date>
<wd:CF_FD_PUBBS_HSA_Valid_To_Date>2020-01-31</wd:CF_FD_PUBBS_HSA_Valid_To_Date>
</wd:CFI_ARI_PUBBS_HSA_group>
<wd:Customer_Invoice_Lines_group>
<wd:referenceID>CUSTOMER_INVOICE_LINE-6-46</wd:referenceID>
<wd:Unit_Cost>0</wd:Unit_Cost>
<wd:Quantity>0</wd:Quantity>
<wd:Calculated_Tax_Amount>0</wd:Calculated_Tax_Amount>
<wd:CFI_AC_Merchandise_Amount>100</wd:CFI_AC_Merchandise_Amount>
<wd:Line_Item_Description>LINE ITEM DESC</wd:Line_Item_Description>
<wd:Line_Memo>LINE MEMO</wd:Line_Memo>
<wd:Transaction_Tax_Amount>0</wd:Transaction_Tax_Amount>
<wd:CFI_LRV_Sales_Item_Reference_ID>FMDAUTOPSY</wd:CFI_LRV_Sales_Item_Reference_ID>
</wd:Customer_Invoice_Lines_group>
<wd:CFI_FD_PUBBS_HSA_Current_Date>2020-02-16</wd:CFI_FD_PUBBS_HSA_Current_Date>
</wd:Report_Entry>
I want to know if the wd:CFI_LRV_Sales_Item_Reference_ID value is equal to wd:Customer_Invoice_Lines_group/wd:CFI_ARI_PUBBS_HSA_group/wd:pubbsService and wd:CFI_FD_PUBBS_HSA_Current_Date is greater than wd:CF_FD_PUBBS_HSA_Valid_To_Date and then just return a string value true if there is. I have a code like this but this doesn't work because I'm comparing a value to an object that has multiple values. Not sure how to do compare single value to an array using xslt 2 or 3.. Appreciate the help.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:mf="http://example.com/mf"
exclude-result-prefixes="#all" version="3.0"
xmlns:wd="urn:com.workday.report/CRI_-_INTSG031_CM_011_-_PUBBS_HSA_Customer_Invoice"
xmlns:d9="urn:this-stylesheet">
<xsl:output method="xml"/>
<xsl:template match="/">
<PUBBS>
<xsl:for-each select="wd:Report_Entry/wd:Customer_Invoice_Lines_group">
<xsl:if test="wd:CFI_LRV_Sales_Item_Reference_ID != ''">
<xsl:for-each select="../wd:CFI_ARI_PUBBS_HSA_group">
<xsl:if test="../wd:CFI_ARI_PUBBS_HSA_group/wd:pubbsService != ''
and wd:CFI_LRV_Sales_Item_Reference_ID = ../wd:CFI_ARI_PUBBS_HSA_group/wd:pubbsService
and xs:date(../wd:CFI_FD_PUBBS_HSA_Current_Date) > xs:date(../wd:CFI_ARI_PUBBS_HSA_group/wd:CF_FD_PUBBS_HSA_Valid_To_Date)
">
<HASINVALIDSALESITEM>
<xsl:value-of select="'true'"/>
</HASINVALIDSALESITEM>
</xsl:if>
</xsl:for-each>
</xsl:if>
</xsl:for-each>
</PUBBS>
</xsl:template>
</xsl:stylesheet>

Answer 1

I have tried to simplify the code by using xpath-default-namespace and by using templates; I have also assumed the two values you want to compare the two details of the various CFI_ARI_PUBBS_HSA_group to only exist once in the input document:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xpath-default-namespace="urn:com.workday.report/CRI_-_INTSG031_CM_011_-_PUBBS_HSA_Customer_Invoice"
exclude-result-prefixes="#all"
version="3.0">
<xsl:output method="xml" indent="yes"/>
<xsl:mode on-no-match="shallow-skip"/>
<xsl:template match="/*">
<PUBBS>
<xsl:apply-templates select="CFI_ARI_PUBBS_HSA_group"/>
</PUBBS>
</xsl:template>
<xsl:template match="CFI_ARI_PUBBS_HSA_group[xs:date(//CFI_FD_PUBBS_HSA_Current_Date) > xs:date(CF_FD_PUBBS_HSA_Valid_To_Date)
and
//CFI_LRV_Sales_Item_Reference_ID = pubbsService]">
<HASINVALIDSALESITEM>true</HASINVALIDSALESITEM>
</xsl:template>
</xsl:stylesheet>
At https://xsltfiddle.liberty-development.net/jz1Q1ym that gives an empty <PUBBS/>, which seems the right result as the only CFI_ARI_PUBBS_HSA_group with pubbsService having the value FMDAUTOPSY has a CF_FD_PUBBS_HSA_Valid_To_Date of 2100-01-01 and the CFI_FD_PUBBS_HSA_Current_Date with the value 2020-02-16 is not greater than that.
It is not quite clear whether you want a single output of HASINVALIDSALESITEM even if there are several but the code could obviously adapted.