<xsd:attribute name="isConfidential">
    <xsd:annotation>
        <xsd:documentation>Transient confidentiality is provided by a secure network
					protocol, such as SSL as the document is transferred between two adjacent ebXML
					Messaging Service or other transport messaging nodes. Persistent
					confidentiality is intended to preserve the confidentiality of the message such
					that only the intended party (application) can see it.</xsd:documentation>
    </xsd:annotation>
    <xsd:simpleType>
        <xsd:restriction base="xsd:NMTOKEN">
            <xsd:enumeration value="none" />
            <xsd:enumeration value="transient" />
            <xsd:enumeration value="persistent" />
            <xsd:enumeration value="transient-and-persistent" />
        </xsd:restriction>
    </xsd:simpleType>
</xsd:attribute>