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Both the transformations and coefficient sets can be configured to be time dependent. This can be used for instance to define a given coefficient value to be 3 from 1 January 2008 to 1 January 2009, and to be 4 from 1 January 2009 onwards. This can be done by defining multiple periodCoefficientSets, each one with a different period, as in the following xml example.

<periodCoefficientSet>
  <period>
    <startDateTime date="2008-01-01" time="00:00:00"/>
    <endDateTime date="2009-01-01" time="00:00:00"/>
  </period>
  <structure>
    <pumpFixedDischarge>
      <discharge>3</discharge>
    </pumpFixedDischarge>
  </structure>
</periodCoefficientSet>
<periodCoefficientSet>
  <period>
    <validAfterDateTime date="2009-01-01"/>
  </period>
  <structure>
    <pumpFixedDischarge>
      <discharge>4</discharge>
    </pumpFixedDischarge>
  </structure>
</periodCoefficientSet>

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If for a given transformation there are different coefficientSets configured for different periods in time, then the following rule is used. The start of a period is always inclusive. The end of a period is exclusive if another period follows without a gap in between, otherwise the end of the period is inclusive. If for example there are three periodCoefficientSets defined (A, B and C), each with a different period, as in the following xml example. Then at 2002-01-01 00:00:00 periodCoefficientSet A is valid. At 2003-01-01 00:00:00 periodCoefficientSet B is valid since the start of the period is inclusive. At 2004-01-01 00:00:00 periodCoefficientSet B is still valid, since there is a gap after 2004-01-01 00:00:00. At 2011-01-01 00:00:00 periodCoefficientSet C is valid, since no other periods follow (the period of C is the last period in time that is defined). This same rule applies to time-dependent transformations.

<periodCoefficientSet>
  <!-- periodCoefficientSet A -->
  <period>
    <startDateTime date="2002-01-01" time="00:00:00"/>
    <endDateTime date="2003-01-01" time="00:00:00"/>
  </period>
  ...
</periodCoefficientSet>
<periodCoefficientSet>
  <!-- periodCoefficientSet B -->
  <period>
    <startDateTime date="2003-01-01" time="00:00:00"/>
    <endDateTime date="2004-01-01" time="00:00:00"/>
  </period>
  ...
</periodCoefficientSet>
<periodCoefficientSet>
  <!-- periodCoefficientSet C -->
  <period>
    <startDateTime date="2010-01-01" time="00:00:00"/>
    <endDateTime date="2011-01-01" time="00:00:00"/>
  </period>
  ...
</periodCoefficientSet>

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