JSFiddle - React, Tailwind, and code Playground

JavaScript

const XML = `<TransmissionHeader xmlns:tran="http://xmlns.oracle.com/apps/otm/TransmissionService" xmlns="">
            <Version>20b</Version>
            <TransmissionCreateDt>
                <GLogDate>20200819124057</GLogDate>
                <TZId>UTC</TZId>
                <TZOffset>+00:00</TZOffset>
            </TransmissionCreateDt>
            <TransactionCount>1</TransactionCount>
            <SenderHostName>https://xxx</SenderHostName>
            <SenderSystemID>https:xxx</SenderSystemID>
            <UserName>OOO</UserName>
            <SenderTransmissionNo>404836</SenderTransmissionNo>
            <ReferenceTransmissionNo>0</ReferenceTransmissionNo>
            <GLogXMLElementName>PlannedShipment</GLogXMLElementName>
            <NotifyInfo>
                <ContactGid>
                    <Gid>
                        <DomainName>OOO</DomainName>
                        <Xid>SYS</Xid>
                    </Gid>
                </ContactGid>
                <ExternalSystemGid>
                    <Gid>
                        <DOMAIN_NAME>OOO</DOMAIN_NAME>
                        <Xid>IOT_SYSTEM</Xid>
                    </Gid>
                </ExternalSystemGid>
            </NotifyInfo>
        </TransmissionHeader>`;


/* console.log('replacing dimain in ', XML); */
if(typeof(String.prototype.trim) === "undefined")
{
    String.prototype.trim = function() 
    {
        return String(this).replace(/^\s+|\s+$/g, '');
    };
}

function replaceDomainName (xmlPayload, oldValue, newValue)
{
  const  parser = new DOMParser();
  const xmlDoc = parser.parseFromString(xmlPayload,"text/xml");
  
  for(let tagName of ['DOMAIN_NAME', 'DomainName']) {
  	const instances = xmlDoc.getElementsByTagName(tagName);
    for (let instance of instances) {
     	if(instance.innerHTML.trim() == oldValue ) 
      	instance.innerHTML = newValue;
    }
  };
  
  const s = new XMLSerializer();
  const d = document;
  const result = s.serializeToString(xmlDoc);
  
 ...