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One can associate multiple thing actions to a Thingfacet Attribute. You can do this by providing comma separated list of Action names. For example,

Assoicating Multiple Thing Actions
<String name="State" KnownBy="SyncImageAction,SyncPresetAction"/>
Multiple Thing Actions
<!-- Actions -->
<Action Name="SyncPresetAction" Documentation="Synchronize camera state and preset">
  <Workflow Limit="1" Live="1" Timeout="PT20S">
    <Task Name="Main" While="true">
      <Event Name="Argument" As="ActionArgument"/>
      <Invoke Name="SetPreset" waitFor="Argument" skip-if="[%:[:AA:].Preset/no-value(Value):%]" delayAfter="PT5S"
        get="[%:[:AA:].URL.Value:%]/cgi-bin/decoder_control.cgi?[:UP:][%:amp:%]command=15[%:amp:%]sit=[%:[:AA:].Preset.Value:%]"/>
      <Output name="Result" as="ActionResult">
        <Value>
          <State> [%:[%:@Output:%]/if([:POK:]) then 'ON' else 'OFF':%]</State>
          <Preset>[%:[%:@Output:%]/if([:POK:]) then '[%:[:AA:].Preset.Value:%]' else null():%]</Preset>
        </Value>
      </Output>
    </Task>
  </Workflow>
</Action>
<Action name="SyncImageAction" documentation="Synchronize camera state and snapshot image">
  <Workflow Limit="1" Live="1" Timeout="PT10S">
    <Task name="Main" while="true">
      <Event name="Argument" as="ActionArgument"/>
      <Invoke name="GetImage" waitFor="Argument" delay="PT1S" get="[%:[:AA:].URL.Value:%]/cgi-bin/video_snapshot.cgi?[:UP:]"/>
      <Output name="Result" as="ActionResult">
        <Value>
          <State>[%:[%:@Output:%]/if([:IOK:]) then 'ON' else 'OFF':%]</State>
          <Image>[%:[%:@Output:%]/if([:IOK:]) then Invoke/GetImage/Message/Value/text() else '/img/no-image.jpg':%]</Image>
        </Value>
      </Output>
    </Task>
  </Workflow>
</Action>

Here you can see two actions: SyncPresetAction and SyncImageActon which deal with camera preset and snapshot image respectively. Both also update camera state.

In case when multiple attributes are updated, the system will select minimum number of actions with highest preference to perform the update[s]. That is, if only state needs to be updated, the engine will use SyncImageAction action and when both state and preset need updates, SyncPresetAction will be used.

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