<xsd:attribute name="sequenceLocation" use="prohibited">
    <xsd:annotation>
        <xsd:documentation xml:lang="en">An indication of where this message falls within a sequence of messages.</xsd:documentation>
    </xsd:annotation>
    <xsd:simpleType>
        <xsd:restriction base="xsd:NMTOKEN">
            <xsd:enumeration value="First">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">This is the first message within the sequence.</xsd:documentation>
                </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Last">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">This is the last message within the sequence.</xsd:documentation>
                </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="InSeries">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">This is any message that is not the first or last message within the sequence.</xsd:documentation>
                </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="SubsequentRequest">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">This request message is a subsequent request based on the previous message sent in the sequence.</xsd:documentation>
                </xsd:annotation>
            </xsd:enumeration>
            <xsd:enumeration value="Rollback">
                <xsd:annotation>
                    <xsd:documentation xml:lang="en">An indication that all messages within the current sequence should be ignored.</xsd:documentation>
                </xsd:annotation>
            </xsd:enumeration>
        </xsd:restriction>
    </xsd:simpleType>
</xsd:attribute>