The core <i>TimeseriesObservation </i>is restricted in two specialised types that represent the two possible timeseries result structures: domain-range and time-value pairs.  <br /></p><p><b>Note: </b>The <i>TimeseriesObservation </i>does not directly subclass the <i>OM_TimeseriesObservation </i>from ISO19156 as this type restricts the result to a <i>CVT_DiscreteTimeInstantCoverage</i>, which is a style of TVP timeseries and thus would not allow the domain-range style of timeseries. <br /></p><p>Future work will attempt to harmonise the definition of timeseries across the ISO/OGC standards. Figure <font color="#ff8040">X</font> shows the relationship between the time-value pair structuring of timeseries with the CVT_DiscreteTimeInstantCoverage type. The Timeseries Profile TimeValuePair type makes the specialisation of the DomainObject (to a temporal component) explicit through the TS_DomainObject. The two types reflect different styles of representing timeseries observations.<br /></p>