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            A repository id or (since Maven 2.0.9) an expression matching one or many repository ids to mirror, e.g.,
            <code>central</code> or <code>*,!repo1</code>.
            <code>*</code> (since Maven 2.0.5), <code>external:*</code> (since Maven 2.0.9) and <code>external:http:*</code> (since Maven 3.8.0) have
            a special meaning: see <a href="/guides/mini/guide-mirror-settings.html">Mirror Settings</a> guide.