gistfile1.xml

    <xsd:element name="sub-flow" type="subFlowType">
        <xsd:annotation>
            <xsd:documentation>
                A chain of message processors processed synchronously that can be referenced and reused.
            </xsd:documentation>
        </xsd:annotation>
    </xsd:element>
    <xsd:complexType name="subFlowType">
        <xsd:complexContent>
            <xsd:extension base="annotatedType">
                <xsd:sequence>
                    <xsd:element name="description" type="descriptionType" minOccurs="0">
                        <xsd:annotation>
                            <xsd:documentation>
                                This can hold any kind of documentation related to the sub-flow. It is intended to be
                                "human readable" only and  is not used by the system.
                            </xsd:documentation>
                        </xsd:annotation>
                    </xsd:element>
                    <xsd:group ref="messageProcessorOrOutboundEndpoint" maxOccurs="unbounded" />
                </xsd:sequence>
                <xsd:attribute name="name" type="nonBlankString" use="required">
                    <xsd:annotation>
                        <xsd:documentation>
                            Identifies the sub-flow in the registry.
                        </xsd:documentation>
                    </xsd:annotation>
                </xsd:attribute>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>