CDA Time Example (http://www.healthintersections.com.au/?p=769)

example.xml

<example xsi:type="QSI_TS"><!-- intersection, because it is a QSI -->
 <!-- every other Tuesday -->
 <term xsi:type='PIVL_TS' alignment='DW'>
  <phase lowClosed='true' highClosed='false'>
   <low value='20001202'/>
   <high value='20001203'/>
  </phase>
  <period value='2' unit='wk'/>
 </term>

 <!-- 2002 and 2003 -->
 <term xsi:type='IVL_TS' lowClosed='true' highClosed='false'>
  <low value='20020101'/>
  <high value='20040101'/>
 </term>
 <!-- season between Memorial Day and Labor Day -->
 <!-- periodic hull between Memorial day and Labor Day -->
 <term xsi:type='QSP_TS'>
  <low xsi:type="QSI_TS">
  <!-- memorial day: intersection of last week of May and mondays -->
   <term xsi:type='PIVL_TS'>
    <phase highClosed='false'>
     <low value='19870525'/>
     <high value='19870601'/>
    </phase>
    <period value='1' unit='a'/>
   </term>
   <term xsi:type='PIVL_TS'>
    <phase highClosed='false'>
     <low value='19870105'/>
     <high value='19870106'/>
    </phase>
    <period value='1' unit='wk'/>
   </term>
  </low>
  <high xsi:type="QSI_TS">
   <!-- labor day :  intersection of first week of Sept and mondays -->
   <term xsi:type='PIVL_TS'>
    <phase highClosed='false'>
     <low value='19870901'/>
     <high value='19870908'/>
    </phase>
    <period value='1' unit='a'/>
   </term>
   <term xsi:type='PIVL_TS'>
    <phase highClosed='false'>
     <low value='19870105'/>
     <high value='19870106'/>
    </phase>
    <period value='1' unit='wk'/>
   </term>
  </high>
 </term>
</example>