how to fetch data from one XML group of elements and feed onto another XML group

Question

I am trying to update an element in below XML using data in secondary or different xml file. Both input XML and secondary XML file has equal number of segments. I need to take a value in first segment of secondary XML and update an element in INPUT xml and so on. I am not sure whether it can be done using XSL or not, can anyone guide me.

To be more specific, i am trying to update INPUT XML's <indicator></indicator> value in each <iOSection> based on secondary XML's //PDetails/PStatus/Code and //PDetails/PStatus/Description values.

Below is INPUT XML file:

<IResponse>
    <iOSection>
        <Details>           
            <Info>
                <pNumber>FB061689</pNumber>
                <indicator></indicator>
                <Identifier>1</Identifier>
            </Info>         
        </Details>
        <Token>
            <Reference>1UUYD05BHM21OJCK3881C7F</Reference>
        </Token>
    </iOSection>
    <iOSection>
        <Details>           
            <Info>
                <pNumber>FB061690</pNumber>
                <indicator></indicator>
                <Identifier>2</Identifier>
            </Info>
        </Details>
        <Token>
            <Reference>1UUYD05BHM21OJCK3881C7F</Reference>
        </Token>
    </iOSection>
</IResponse>

below is secondary XML file - it is available in xsl variable called RSPDetails

<RS PartID="abcd" SysID="mnc">  
    <PDetails>
        <PN>FB063586</PN>
        <PStatus>
            <Code>0</Code>
            <Description>Cancelled</Description>
        </PStatus>     
    </PDetails>
    <PDetails>
        <Error>
            <Code>92</Code>
            <Message>failed</Message>
        </Error>
    </PDetails>
</RS>

The value of <indicator> should be 'YES' when //PDetails/PStatus/Code = '0' and //PDetails/PStatus/Description = 'Cancelled' , in all other cases it should be 'NO'

The condition should apply for <iOSection> position 1 using <PDetails> position 1 data and <iOSection> position 2 using <PDetails> position 2 data and so on

Expecting OUTPUT is:

<IResponse>
    <iOSection>
        <Details>           
            <Info>
                <pNumber>FB061689</pNumber>
                <indicator>YES</indicator>
                <Identifier>1</Identifier>
            </Info>         
        </Details>
        <Token>
            <Reference>1UUYD05BHM21OJCK3881C7F</Reference>
        </Token>
    </iOSection>
    <iOSection>
        <Details>           
            <Info>
                <pNumber>FB061690</pNumber>
                <indicator>NO</indicator>
                <Identifier>2</Identifier>
            </Info>
        </Details>
        <Token>
            <Reference>1UUYD05BHM21OJCK3881C7F</Reference>
        </Token>
    </iOSection>
</IResponse>

I tried below XSL, but not getting anywhere closer

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"  xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="#all" >

    <xsl:template match="@* | node()">
        <xsl:copy>
            <xsl:apply-templates select="@* | node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="/*[local-name()='IResponse']/*[local-name()='iOSection']/*[local-name()='Details']/*[local-name()='Info']/*[local-name()='indicator']">

        <xsl:variable name="RSDetails">
            <RS PartID="abcd" SysID="mnc">
                <PDetails>
                    <PN>FB063586</PN>
                    <PStatus>
                        <Code>0</Code>
                        <Description>Cancelled</Description>
                    </PStatus>
                </PDetails>
                <PDetails>
                    <Error>
                        <Code>92</Code>
                        <Message>failed</Message>
                    </Error>
                </PDetails>
            </RS>       
        </xsl:variable> 

        <xsl:element name="indicator">
            <xsl:variable name="PStatus">
                <xsl:value-of select="$RSDetails/RS/PDetails/PStatus" />
            </xsl:variable>
            <xsl:variable name="Message">
                <xsl:value-of select="$RSDetails/RS/PDetails/Message" />
            </xsl:variable>

            <xsl:choose>
                <xsl:when test="$PStatus='0' and $Message='Cancelled'">
                    <xsl:value-of select="'YES'" />
                </xsl:when>
                <xsl:otherwise>
                    <xsl:value-of select="'NO'" />
                </xsl:otherwise>
            </xsl:choose>

        </xsl:element>
        <xsl:copy-of select="@*" />
    </xsl:template>
</xsl:stylesheet>

Answer 1

What you want to do here is lookup a value from a matching node in the external file. You didn't say so, but I presume the matching node is the one where the PN value matches the local pNumber.

XSLT 1.0

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:param name="RSPDetails" select="document('your_other_file.xml')" />
<xsl:key name="rsp" match="PDetails" use="PN" />

<!-- identity transform -->
<xsl:template match="@*|node()">
    <xsl:copy>
        <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
</xsl:template>

<xsl:template match="indicator">
    <xsl:copy>
        <xsl:variable name="pnum" select="../pNumber"/>
        <!-- switch context to the other file -->
        <xsl:for-each select="$RSPDetails">
            <xsl:choose>
                <xsl:when test="key('rsp', $pnum)/PStatus/Code=0 and key('rsp', $pnum)/PStatus/Description='Cancelled'">YES</xsl:when>
                <xsl:otherwise>NO</xsl:otherwise>
            </xsl:choose>
        </xsl:for-each>
    </xsl:copy>
</xsl:template>

</xsl:stylesheet>

---

Edit:

To base the lookup on position, try:

<xsl:template match="indicator">
    <xsl:copy>
        <xsl:variable name="i">
            <xsl:number count="iOSection"/>
        </xsl:variable>
        <xsl:variable name="detail" select="$RSPDetails/RS/PDetails[number($i)]"/>
        <xsl:choose>
            <xsl:when test="$detail/PStatus/Code=0 and $detail/PStatus/Description='Cancelled'">YES</xsl:when>
            <xsl:otherwise>NO</xsl:otherwise>
        </xsl:choose>
    </xsl:copy>
</xsl:template>

The <xsl:key> instruction is not necessary in this scenario.