Configure scope with XML in Magento

XML scope structure

In Magento's XML files, scope is implemented through specific node structures that map directly to the scope hierarchy:

<?xml version="1.0"?>
<config xmlns:xsi="<http://www.w3.org/2001/XMLSchema-instance>" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <!-- Global default settings -->
    <default>
        <!-- Configuration goes here -->
    </default>

    <!-- Website-specific settings -->
    <websites>
        <website_code>
            <!-- Configuration goes here -->
        </website_code>
    </websi...