<constraints>

    <overwrite>

        <conditions>

            <arch>i586</arch>

            <arch>x86_64</arch>

        </conditions>

        <hardware>

            <disk>

                <size unit="G">8</size>

            </disk>

            <physicalmemory>

                <size unit="G">4</size>

            </physicalmemory>

        </hardware>

    </overwrite>

</constraints>

​