update to conform to TS 103 548

* Systems and connections. This module defines the different systems modelled within a smart lift environment. A system is described as a component virtually isolated from the environment, whose behaviour and interactions with the environment are specifically defined. Systems can be connected to other systems. Connected systems interact in some ways. Systems can also have subsystems. Properties of subsystems somehow contribute to the properties of the supersystem.

* Devices and commands. This module defines the devices included within a smart lift. A device is defined as a tangible object designed to accomplish a particular task. In order to accomplish this task, the device performs one or more functions. The root of this branch ([saref:Device](https://saref.etsi.org/core/Device)) is inherited directly from the SAREF Core ontology. Also, this module defines commands supported by the defined smart lift. A command is defined as a directive that a device should support to perform a certain function. A command may act upon a state, but does not necessarily act upon a state. For example, the ON command acts upon the ON/OFF state, but the GET command does not act upon any state, it simply gives a directive to retrieve a certain value. The root of this branch ([saref:Command](https://saref.etsi.org/core/Command)) is inherited directly from the SAREF Core ontology.

* States and observations. This module defines states that features of interest in a smart lift installation can be found in, and observations that can be made about features of interest in a smart lift.

* Signals. This module describes the types of signals supported by a smart lift. Four types of signals have been identified: car signal ([s4lift:AlarmSignal](#s4lift:AlarmSignal)), fault signal ([s4lift:FaultSignal](#s4lift:FaultSignal)), status signal ([s4lift:StatusSignal](#s4lift:StatusSignal)), and statistic signal ([s4lift:StatisticSignal](#s4lift:StatisticSignal)). Clause 6.2.5 provides a complete taxonomy of supported signals with respect to the ones reported in [Figure 6.2.1-1](#Figure_6.2.1-1).

* States and properties. This module defines states and properties of smart lift installations and related features of interest.

* Signals. This module describes the types of signals supported by a smart lift. Four types of signals have been identified: alarm signal ([s4lift:AlarmSignal](#s4lift:AlarmSignal)), fault signal ([s4lift:FaultSignal](#s4lift:FaultSignal)), status signal ([s4lift:StatusSignal](#s4lift:StatusSignal)), and statistic signal ([s4lift:StatisticSignal](#s4lift:StatisticSignal)). Clause 6.2.5 provides a complete taxonomy of supported signals with respect to the ones reported in [Figure 6.2.1-1](#Figure_6.2.1-1).

Besides the four modules described above, the SAREF4LIFT extension defines also two new property types ([s4lift:Load](#s4lift:Load) and [s4lift:Voltage](#s4lift:Voltage)) defining the load in the smart lift car and the electric voltage of some electric power system.

### <a id="6.2.3"></a>Devices and commands

This model specifies the list of commands that is considered relevant for the smart lift domain. Six new commands are defined as instances of the [saref:Command](https://saref.etsi.org/core/Command) concept that can be triggered, in turn, by a [saref:Function](https://saref.etsi.org/core/Function) as presented in [Figure 6.2.3-1](#Figure_6.2.3-1):

This model specifies the list of commands that is considered relevant for the smart lift domain. Six new commands are defined as instances of the [saref:Command](https://saref.etsi.org/core/Command) class that can be executed, as presented in [Figure 6.2.3-1](#Figure_6.2.3-1):

* [s4lift:MainBoardResetCommand](#s4lift:MainBoardResetCommand) defines the command for resetting the main board of a smart lift;

* [s4lift:SendCarToSpecificServiceCommand](#s4lift:SendCarToSpecificServiceCommand) defines the internal command for sending the car to a specific service;

### <a id="6.2.4"></a>States and observations

This module defines states that features of interest in a smart lift installation can be found in, and observations that can be made about features of interest in a smart lift.

This module defines states and properties of smart lift installations and related features of interest.

<figure>

    <img src="diagrams/StatesAndObservations.png" alt="States and observations model"/>

    <img src="diagrams/StatesAndProperties.png" alt="States and properties model"/>

    <figcaption id="Figure_6.2.4-1">Figure 6.2.4-1: States and observations model</figcaption>

</figure>

* [s4lift:AlarmSignal](#s4lift:AlarmSignal): this defines high priority signals used to attract the operator's attention to important deviations or abnormal events in system operation.

* [s4lift:StatisticSignal](#s4lift:StatisticSignal): such signals convey ([s4lift:conveys](#s4lift:conveys)) a [s4lift:StatisticsObservation](#s4lift:StatisticsObservation) about the smart lift usage.

* [s4lift:FaultSignal](#s4lift:FaultSignal): these are the signals sent by the smart lift car about its overall status. This concept subsumes three further concepts grouping likewise car signal types.

* [s4lift:StatusSignal](#s4lift:StatusSignal): these are signals that convey ([s4lift:conveys](#s4lift:conveys)) a [saref:State](https://saref.etsi.org/core/State) of a feature of interest.

* [s4lift:StatusSignal](#s4lift:StatusSignal): these are signals that convey ([s4lift:conveys](#s4lift:conveys)) an observation of a [saref:State](https://saref.etsi.org/core/State) of a feature of interest.

Descendants of the [s4lift:Signal](#s4lift:Signal) inherit the [saref:hasTimestamp](https://saref.etsi.org/core/hasTimestamp), [saref:isAbout](https://saref.etsi.org/core/isAbout), and [s4lift:conveys](#s4lift:conveys) properties defining the timestamp when the signal has been generated and its value, respectively.

Descendants of the [s4lift:Signal](#s4lift:Signal) inherit the [saref:hasTimestamp](https://saref.etsi.org/core/hasTimestamp), [saref:observes](https://saref.etsi.org/core/observes), and [s4lift:conveys](#s4lift:conveys) properties defining the timestamp when the signal has been generated and its value, respectively.

<figure>

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