<first xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:noNamespaceSchemaLocation="gmlas_composition_compositionPart.xsd">
    <composition>
        <CompositionPart my_id="id1">
            <a>a1</a>
        </CompositionPart>
    </composition>
    <composition>
        <CompositionPart my_id="id2">
            <a>a2</a>
        </CompositionPart>
    </composition>
</first>
