<simpleType name="substitutionType.Rugby.Vocabulary">
    <restriction base="string">
        <enumeration value="blood">
            <annotation>
                <documentation>A temporary replacement in which the player must return to the field within 15 minutes</documentation>
            </annotation>
        </enumeration>
        <enumeration value="regular">
            <annotation>
                <documentation>One of seven allowed permanent player substitutions.</documentation>
            </annotation>
        </enumeration>
    </restriction>
</simpleType>