Specifying Standard Objects

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To retrieve standard objects and/or custom fields on standard objects, you must name the component in package.xml. The following package.xml file will retrieve a single field EngineeringReqNumber__c, on the Case object, as well as the entire Account object.

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Case.EngineeringReqNumber__c</members>
        <name>CustomField</name>
    </types>
    <types>
        <members>Account</members>
        <name>CustomObject</name>
    </types>
    <version>68.0</version>
</Package>

note: Custom objects and standard objects should be specified in the same <types> section, the one containing <name>CustomObject</name>.