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Workflow instances run on top of pipelines, that is, they use pipelines to be instantiate, trigger or communicate. We call the pipeline that instantiate a workflow instance the originating pipeline. Based on the relationship between the workflow and its originating pipeline, workflow can be categorized into non-repeatable workflows and repeatable workflows.

In non-repeatable workflow, the originating pipeline waits until the workflow completes. In repeating working, the originating pipeline does not wait. The workflow, after being instantiated, may be triggered by a different pipeline.

Code Block

language	xml
title	Example for Internally continued workflows

<ThingFacet Name="PhidgetRFID">
  <Sid Name="RFIDId" />
  <String Name="ReadTag" Update="auto" KnownBy="PhidgetReadRFIDTagAc" />
  <String Name="WriteTag" KnownBy="PhidgetWriteRFIDTagAc" />
  <String Name="RFIDURL" Default="phid://" />
  <String Name="InterfaceType" />
  <String Name="InterfaceIndex" />
  <Unique Name="RFIDIndex" Value="InterfaceIndex" />
  <DateTime Name="timestamp" Format="$SimpleDateFormat(yyyy-MM-dd'T'HH:mm:ss'Z')" />
  <AA>
    [:#o#Output.ActionArgument:]
  </AA>
  <Action Name="PhidgetReadRFIDTagAc" Documentation="Read the Tag Automatically in the vicinity">
    <Workflow Limit="1" Live="1" Timeout="-1">
      <Task name="Main" while="true">
        <Event name="Argument" as="ActionArgument" />
        <Invoke name="ReadValue" waitFor="Argument"
                get="[%:Event.Argument.RFIDURL.Value:%]" SerialNumber="[%:Event.Argument.InterfaceIndex.Value:%]"
                DeviceType="[%:Event.Argument.InterfaceType.Value:%]" />
        <Output name="Result" as="ActionResult">
          <Value>
            <ReadTag>
              [%:[%:@Output:%]Invoke.ReadValue.Message.Value:%]
            </ReadTag>
          </Value>
        </Output>
      </Task>
    </Workflow>
  </Action>
  <Action Name="PhidgetWriteRFIDTagAc" Documentation="Write the Tag Value to RFID in the vicinity">
    <Workflow Limit="1" Live="1" Timeout="-1">
      <Task name="Main" while="true">
        <Output name="ActionArgument" as="ActionArgument" />
        <Invoke name="WriteValue" waitFor="ActionArgument"
                skip-if="[%:[:AA:].WriteTag/no-value(Value):%]" post="[%:[:AA:].RFIDURL.Value:%]"
                SerialNumber="[%:[:AA:].InterfaceIndex.Value:%]"
                SensorType="WriteTag" DeviceType="[%:[:AA:].InterfaceType.Value:%]">
          <Message Type="text" Value="[%:[:AA:].WriteTag.Value:%]" />
        </Invoke>
        <Output name="Result" as="ActionResult">
          <Value>
            <WriteTag>
              [%:[%:@Output:%]Invoke.WriteValue.Message.Value:%]
            </WriteTag>
          </Value>
        </Output>
      </Task>
    </Workflow>
  </Action>
</ThingFacet>

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