identifier of the «abstract» Composition entity defined in the MTConnectDevices Response Documentresponse document published by an MTConnect Agent in response to a probe request. associated with the data reported for the Observation.
::dataItemIdMUST match the ::id attribute of the DataItem defined in the MTConnectDevices Response Documentresponse document published by an MTConnect Agent in response to a probe request..
::nameMUST match the ::name attribute of the DataItem defined in the MTConnectDevices Response Documentresponse document published by an MTConnect Agent in response to a probe request..
number representing the sequential position of an occurrence of an observationobserved value of a property at a point in time. in the data buffer of an agentsoftware that collects data published from one or more piece(s) of equipment, organizes that data in a structured manner, and responds to requests for data from client software systems by providing a structured response in the form of a response document that is constructed using the semantic data model of a Standard. .
::sequenceMUST have a value represented as an unsigned 64-bit value from 1 to \(2^{64}-1\).
::subTypeMUST match the ::subType attribute of the DataItem defined in the MTConnectDevices Response Documentresponse document published by an MTConnect Agent in response to a probe request..
::typeMUST match the ::type attribute of the DataItem defined in the MTConnectDevices Response Documentresponse document published by an MTConnect Agent in response to a probe request..
::unitsMUST match the ::units attribute of the DataItem defined in the MTConnectDevices Response Documentresponse document published by an MTConnect Agent in response to a probe request..
> Note 2 to entry: In *JSON*, when `isUnavailable` is `true`, the *JSON* `value` of the `Observation` **MUST** be `UNAVAILABLE`.
```json
"Execution" : [ { "dataItemId": "..." ..., "value": "UNAVAILABLE" } ]
observationobserved value of a property at a point in time. of the Observation entity.
The default value type for ::result is string.
Note 1 to entry: in XML the Observation::result is the CDATA of the Observation elementconstituent part or a basic unit of identifiable and definable data. ```xml
<Execution dataItemId=”…” …>READY</Execution>
> Note 2 to entry: in *JSON* the [`Observation::result`](/Version2.2/AgentArchitecture/InformationModel/Observation/#result) is the member `value` of the Observation object
```json
"Execution" : [ { "dataItemId": "..." ..., "value": "READY" } ]
identifies when a reported value has been reset and what has caused that reset to occur for those DataItem entities that may be periodically reset to an initial value.
::resetTriggeredMUST only be provided for the specific occurrence of a DataItem reported in the MTConnectStreams Response Documentresponse document published by an MTConnect Agent in response to a current request or a sample request. when the reset occurred.