<FeatureCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                   xmlns:xlink="http://fake_xlink"
                   xsi:noNamespaceSchemaLocation="gmlas_internal_xlink_href.xsd">
    <main_elt>
        <link_to_second_or_third_elt xlink:href="#does_not_exist"/>
    </main_elt>
    <main_elt>
        <link_to_second_or_third_elt xlink:href="#id2"/>
    </main_elt>
    <main_elt>
        <link_to_second_or_third_elt xlink:href="#id3"/>
    </main_elt>
    <main_elt>
        <link_to_second_or_third_elt xlink:href="#id4"/>
    </main_elt>
    <main_elt>
        <link_to_third_elt xlink:href="#id4"/>
    </main_elt>
    <main_elt>
        <link_to_second_or_third_elt>
            <second_elt id="id1"/>
        </link_to_second_or_third_elt>
    </main_elt>

    <second_elt id="id2"/>

    <second_elt id="id3"/>

    <third_elt id="id4"/>

</FeatureCollection>