Package.xml in ANT to Fetch Standard Objects in Salesforce

Sample package.xml file to fetch Opportunity Object

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Opportunity</members>
        <name>StandardObject</name>
    </types>
    <version>30.0</version>
</Package>

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