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I get data in XML from a web service from a connector URL, the xml contains data about people, now I have to read the names, emailids from that xml and compare with my org's contacts and so some operations. So how do I read it?

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You need either Dom or XmlStreamReader class to parse your xml response. You can find sample code in the below links.

Xml parsing using XmlStreamReader:- https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_xml_streaming_reading.htm

Xml parsing using Dom:- https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_xml_dom.htm

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    Please do not post link only answers as they can lose their value if the links break, include a bit of relevant information from the linked site.
    – Dave Humm
    Oct 5, 2016 at 5:49
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I did a similar thing in the past. I fixed it fist by parsing the XML retrieved from connect into JSON using xml2js library

const parser = new xml2js.Parser();
const message = await parser.parseStringPromise(xml);

The fields that you add to a DocuSign document are included deep into the json structure

const tabStatus = message.DocuSignEnvelopeInformation.EnvelopeStatus[0].RecipientStatuses[0].RecipientStatus[0].TabStatuses[0];

Then, you just need to find the element of the value that you want. In this example, I search for a field with tab label amount, and extract the value using TabValue[0]

const amount = tabStatus.TabStatus.find(field => field.TabLabel[0] == 'amount')
subscription.amount = amount.TabValue[0];

hope it helps.

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