@@ -34,7 +34,7 @@ As it appears in [Figure 3](#Figure_3), the modelling of observations in the SAR
SAREF allows to define the temporal extent of an observation by defining the timestamp for it (using the [saref:hasResultTime](https://saref.etsi.org/core/hasResultTime) property) and to define the temporal interval to which an observation applies, apart from the temporal instant defined by the timestamp (using the [saref:hasPhenomenonTime](https://saref.etsi.org/core/hasPhenomenonTime) property).
Besides, the extension requires to be able to represent those devices that observe a certain feature of interest (and those features of interest that are observed by a device) independently of having observations from which this relationship could be inferred. This can be represented with two properties of SAREF that relate [saref:Device](https://saref.etsi.org/core/Device) and [saref:FeatureOfInterest](https://saref.etsi.org/core/FeatureOfInterest): [saref:actsUpon](https://saref.etsi.org/core/actsUpon) and [saref:isActedUponBy](https://saref.etsi.org/core/isActedUponBy).
Besides, the extension requires to be able to represent those devices that observe a certain feature of interest (and those features of interest that are observed by a device) independently of having observations from which this relationship could be inferred. This can be represented with two properties of SAREF that relate [saref:Device](https://saref.etsi.org/core/Device) and [saref:FeatureOfInterest](https://saref.etsi.org/core/FeatureOfInterest): [saref:targets](https://saref.etsi.org/core/targets) and [saref:isTargetOf](https://saref.etsi.org/core/isTargetOf).