Search and get content from data in XML and then place that value in another tag using powershell - powershell

Question

Sample text file contains:
`<?xml version="1.0" encoding="UTF-8" ?>
<Document xmlns ="urn:iso:std:iso:20022:tech:xsd:camt.056.001.01"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<FIToFIPmtCxlReq>
<Assgnmt>
<Id>ID123456</Id>
<Assgnr>
<Agt>
<FinInstnId>
<BIC>BICSEND</BIC>
</FinInstnId>
</Agt>
</Assgnr>
<Assgne>
<Agt>
<FinInstnId>
<BIC>BICRCV</BIC>
</FinInstnId>
</Agt>
</Assgne>
<CreDtTm>2020-12-16T09:05:15.0Z</CreDtTm>
</Assgnmt>
<CtrlData>
<NbOfTxs>1</NbOfTxs>
<CtrlSum>0</CtrlSum>
</CtrlData>
<Undrlyg>
<TxInf>
<CxlId>20201216.105.19344855940590400</CxlId>
<OrgnlGrpInf>
<OrgnlMsgId>REF123456789</OrgnlMsgId>
<OrgnlMsgNmId>pacs.008</OrgnlMsgNmId>
</OrgnlGrpInf>
<OrgnlInstrId>FT123456</OrgnlInstrId>
<OrgnlEndToEndId>NOTPROVIDED</OrgnlEndToEndId>
<OrgnlTxId>20201216.100.02202020</OrgnlTxId>
<OrgnlIntrBkSttlmAmt Ccy="EUR">25.23</OrgnlIntrBkSttlmAmt>
<OrgnlIntrBkSttlmDt>2020-12-16</OrgnlIntrBkSttlmDt>`
Please be informed that I would like to code PowerShell to extract the data in tag <OrgnlIntrBkSttlmAmt> (please note that the data length can change since this is an amount field) and then replace the "0" in tag <CtrlSum> with "25.23".
Can someone help me with this.
Thank you for your time.

Answer 1

The xml you show us is invalid as it is missing the following closing tags:
</TxInf>
</Undrlyg>
</FIToFIPmtCxlReq>
</Document>
If I add these, you could do this to update the value in the <CtrlSum> tag:
# load the xml from file
[xml]$xml = Get-Content -Path 'D:\Test\test.xml' -Raw
# get the amount from the 'OrgnlIntrBkSttlmAmt' tag
$amount = $xml.Document.FIToFIPmtCxlReq.Undrlyg.TxInf.OrgnlIntrBkSttlmAmt.'#text'
# use that amount to put in the 'CtrlSum' tag
$xml.Document.FIToFIPmtCxlReq.CtrlData.CtrlSum = $amount
# save the updated xml to file
$xml.Save('D:\Test\test.xml')