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It is also possible in a locationSet to link to time-dependent attributes. Time-dependent attributes need to be defined in a separate DBF file. In the locationSet use the attributeFile tag to make a reference to such a file. The following xml example has a reference to the file PumpStationsAttributes.dbf, which contains attributes that have different values for different periods in time, as well as different values for different locations. In this case the startDateTime and endDateTime tags are used to define the columns in the DBF file that contain the start and end dateTimes for each row. A given row in the DBF file contains values that are only valid between the time period for that row. This period is defined by the optional startDateTime and endDateTime for that row. If a row has no startDateTime, then it is valid always before the endDateTime. If a row has no endDateTime, then it is valid always after the startDateTime. If a row has no startDateTime and no endDateTime, then it is always valid.

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In the new transformation module it is possible to define transformations with embedded coefficientSetFunctions in a transformation config file. For a given transformation, e.g. StructurePumpFixedDischarge, there is a choice between a coefficientSetFunctions object and a coefficientSet object. The coefficientSetFunctions object is the same as its corresponding coefficientSet counterpart, only all elements with a value are replaced by elements with a function. A function is a function expression that can refer to location attributes, e.g. "@discharge@ / 60". See the following xml example.

TODO<transformation id="pump with coefficient set functions">
  <structure>
    <pumpFixedDischarge>
      ...
      <coefficientSetFunctions>
        <discharge><at:var at:name="discharge" /> / 1000</discharge>
      </coefficientSetFunctions>
      ...
    </pumpFixedDischarge>
  </structure>
</transformation>

A coefficientSetFunction can be very useful when using coefficients that depend on location and/or time. In that case the coefficientSetFunction needs to be defined only once with a link to the correct attributes. The attributes are defined in a DBF file. Then a transformation run will use the coefficientSetFunction to create coefficientSets for each location and time-period by taking the required values from the attributes from the DBF file automatically.

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