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        <variable>
	                <variableId>Observation</variableId>
	<timeSeriesSet>
                <timeSeriesSet>
                	<moduleInstanceId>Afgeleide_Twentekanalen</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>H.meting</parameterId>
			<locationSetId>Hydro_LMW_TK_H</locationSetId>
			<timeSeriesType>external historical</timeSeriesType>
			<timeStep unit="hour"/>
			<relativeViewPeriod unit="hour" start="-1" end="0"/>
			<readWriteMode>read only</readWriteMode>
		</timeSeriesSet>
	</variable>
        <variable>
        	<variableId>Correction</variableId>
	        <timeSeriesSet>
	                <moduleInstanceId>Afgeleide_Twentekanalen</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>H.meting</parameterId>
			<locationSetId>Hydro_LMW_TK_H</locationSetId>
			<timeSeriesType>external historical</timeSeriesType>
			<timeStep unit="hour"/>
			<relativeViewPeriod unit="hour" start="-1" end="0"/>
			<readWriteMode>read only</readWriteMode>
		</timeSeriesSet>
	</variable>
        <variable>
	<variableId>Observation_minus_correction</variableId>
	<timeSeriesSet>
              	<moduleInstanceId>Afgeleide_Twentekanalen</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>H.meting</parameterId>
			<locationSetId>Hydro_LMW_TK_H</locationSetId>
			<timeSeriesType>temporary</timeSeriesType>
			<timeStep unit="hour"/>
			<relativeViewPeriod unit="hour" start="-1" end="0"/>
			<readWriteMode>add originals</readWriteMode>
                        <synchLevel>9</synchLevel>
		</timeSeriesSet>
	</variable>
	<transformation id="UserSimpleTransformationTest1TransformationObservationMinusCorrection">
		<user>
			<simple>
				<expression>Observation - Correction</expression>
				<outputVariable>
					<variableId>Observation_minus_correction</variableId>
				</outputVariable>
			</simple>
		</user>
	</transformation>
...