XML (Extensible Markup Language)
In Salesforce metadata and APIs, the markup language used for SOAP API request/response payloads, metadata deployment packages, and configuration files like package.xml that define the structure of…
Definition
In Salesforce metadata and APIs, the markup language used for SOAP API request/response payloads, metadata deployment packages, and configuration files like package.xml that define the structure of data exchanged with the platform.
In plain English
“XML (Extensible Markup Language) in Salesforce is used for SOAP API request/response payloads, metadata deployment packages, and configuration files like package.xml. It's the structured data format behind many Salesforce platform operations.”
Worked example
The release engineer at Ramsbottom Capital deploys a metadata package using the SFDX CLI; the package's manifest is package.xml - an XML document that lists every Apex class, custom field, and Flow component in the deploy. When the deploy runs, the SFDX CLI bundles those components, sends them to the Metadata API, and the API returns an XML response with success or error details for each. SOAP API requests and responses for the same org are also XML - typed envelopes with sf:Account elements wrapping each record. XML is the structured-text format that runs underneath much of Salesforce's metadata and SOAP plumbing, even when modern usage favors JSON for REST.
Why XML (Extensible Markup Language) matters
In Salesforce metadata and APIs, XML (Extensible Markup Language) is the markup language used for SOAP API request/response payloads, metadata deployment packages, and configuration files like package.xml and destructiveChanges.xml. XML is foundational to how Salesforce metadata is stored, transferred, and deployed.
While REST API uses JSON and is the modern standard, XML remains essential for metadata operations. Every metadata deployment uses XML-formatted component files, and package.xml defines what's included in deployments. Mature Salesforce developers work with XML regularly for metadata operations even when they use REST/JSON for data operations.
How organizations use XML (Extensible Markup Language)
Works with XML for metadata deployment packages and package.xml.
Uses XML in metadata operations while preferring JSON for data API work.
Teaches XML as essential for Salesforce metadata operations.
Test your knowledge
Q1. What is XML used for in Salesforce?
Q2. What file uses XML for deployments?
Q3. REST or SOAP uses XML?
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