A flow activity typically contains many sequence activities. Each sequence is performed in parallel. The following example shows the syntax for two sequences of the Retrieve_QuotesFromSuppliers flow activity in the OrderProcessor.bpel file after design completion. However, a flow activity can have many sequences. A flow activity can also contain other activities. In the following example, each sequence in the flow contains assign, invoke, and receive activities.

<flow name="Retrieve_QuotesFromSuppliers">
    <sequence name="Sequence_4">
        <assign name="Assign_InternalWarehouseRequest">
           <copy>
           <from>$inputVariable.gOrderInfoVariable/ns3:CardNum</from>
           <to>lInternalWarehouseInputVariable/ns4:ccnb</to>
         </copy>
        </assign>
        <invoke name="Invoke_InternalWarehouse"
            inputVariable="lInternalWarehouseInputVariable"
            partnerLink="InternalWarehouseService"
            portType="ns1:InternalWarehouseService"
            operation="process"/>
        <receive name="Receive_InternalWarehouse"
            createInstance="no"
            variable="lInternalWarehouseResponseVariable"
            partnerLink="InternalWarehouseService"
            portType="ns1:InternalWarehouseServiceCallback"
            operation="processResponse"/>
        <assign name="Assign_InterWHResponse">
            <bpelx:append>
                <bpelx:from variable="lInternalWarehouseResponseVariable"
                       part="payload"
                       query="/ns1:WarehouseResponse"/>
                <bpelx:to variable="gWarehouseQuotes"
                       query="/ns1:WarehouseList"/>
            </bpelx:append>
        </assign>
    </sequence>
    <sequence name="Sequence_4">
        <assign name="Assign_PartnerRequest">
            <copy>
                <from variable="gOrderInfoVariable"
                    query="/ns4:orderInfoVOSDO"/>
                <to variable="lPartnerSupplierInputVariable"
                    part="request" query="/ns4:orderInfoVOSDO"/>
            </copy>
        </assign>
        <invoke name="Invoke_PartnerSupplier"
            partnerLink="PartnerSupplierMediator"
            portType="ns15:execute_ptt" operation="execute"
            inputVariable="lPartnerSupplierInputVariable"/>
        <receive name="Receive_PartnerResponse"
            createInstance="no"
            variable="lPartnerResponseVariable"
            partnerLink="PartnerSupplierMediator"
            portType="ns15:callback_ptt" operation="callback"/>
            <assign name="Assign_PartnerWHResponse">
                <bpelx:append>
                    <bpelx:from variable="lPartnerResponseVariable"
                           part="callback"
                           query="/ns1:WarehouseResponse"/>
                           <bpelx:to variable="gWarehouseQuotes"
                           query="/ns1:WarehouseList"/>
                    </bpelx:append>
            </assign>
    </sequence>
</flow>