Deleted terms not used in the extensions

Closes #3

See merge request SAREF/saref-core!31

Added the file with the SAREF figures

See merge request SAREF/saref-core!32

Removed also the devices related to the SAREF4ENER extension.

Closes #3.

Closes issue #15

Closes #15 and #23

See merge request SAREF/saref-core!30

Domains and ranges included for the new properties: hasProperty/isPropertyOf and hasMeasurement/isMeasurementOf.

- saref:accomplishes: A relationship between a certain entity (e.g., a device) and the task it accomplishes
From this definition, it is unambiguous that the object of a saref:accomplishes relationship is always a task.
- saref:accomplishes - A relationship between a certain entity (e.g., a device) and the task it accomplishes
  - domain is saref:Command and range is saref:State
- saref:actsUpon - A relationship between a command and a state
  - domain saref:Command, range saref:State
- saref:controlsProperty - A relationship specifying the Property that can be controlled by a certain Device
  - domain saref:Device, range saref:Property
- saref:hasCommand - A relationship between an entity (such as a function) and a command
  - domain saref:Function and range saref:Command
- saref:hasFunction - A relationship identifying the type of function of a device
  - domain saref:Device and range saref:Function
- saref:hasMeterReading - A relationship between a metering function and the measurement of the reading
  - domain saref:MeteringFunction and range saref:Measurement.
- saref:hasMeterReadingType - A relationship identifying the reading type of a measurement (e.g., Water, Gas, Pressure , Energy , Power, etc.)
  - domain saref:Measurement and range saref:Property
- saref:hasPrice - A relationships indentifying the price associated to an entity
  - range saref:Price
- saref:hasProfile - A relationship associating a profile to a certain entity (e.g., a device)
  - domain saref:Device and range saref:Profile
- saref:hasSensingRange - A relationship between a sensing function and a measurement identifying the range of a sensor detection
  - domain saref:SensingFunction and range saref:Measurement
- saref:hasSensorType - A relationship identifying the sensing type of a sensor detection (i.e., Temperature, Occupancy, Humidity, Motion , Smoke, Pressure, etc.)
  - domain saref:SensingFunction and range Property
- saref:hasState - A relationship identifying the type of state of a device
  - domain saref:Device and range saref:State
- saref:hasThresholdMeasurement - A relationship associated with an event function to notify that a certain threshold measurement has been exceeded
  - domain saref:EventFunction and range saref:Measurement
- saref:hasTime - A relationship to associate time information to an entity
  - range saref:Time
- saref:isAccomplishedBy - A relationship identifying the task accomplished by a certain entity (e.g., a device)
  - domain saref:Task
- saref:isCommandOf - A relationship between a command and a function.
  - domain saref:Command and range saref:Function
- saref:isControlledByDevice - A relationship specifying the devices that can control a certain property
  - domain saref:Property and range saref:Device
- saref:isMeasuredByDevice - A relationship specifying the devices that can measure a certain property
  - domain saref:Property and range saref:Device
- saref:isMeasuredIn - A relationship identifying the unit of measure used for a certain entity.
  - domain saref:Measurement and range saref:UnitOfMeasure
- saref:isOfferedBy - A relationship between a service and a device that offers the service
  - domain saref:Service and range saref:Device
- saref:makesMeasurement - A relation between a device and the measurements it makes. Such measurement will link together the value of the measurement, its unit of measure and the property to which it relates.
  - domain saref:Device and range saref:Measurement
- saref:measuresProperty - A relationship specifying the Property that can be measured by a certain Device
  - domain saref:Device and range saref:Property
- saref:offers - A relationship between a device and a service
  - domain saref Device and range saref:Service
- saref:relatesToMeasurement - A relationship between a property and the measurements it relates to
  - domain saref:Property and range saref:Measurement
- saref:relatesToProperty - A relationship between a measurement and the property it relates to
  - domain saref:Measurement and range saref:Property
- saref:represents - A relationship between a service and a function.
  - domain saref:Service and range saref:Function

**Proposal:** To add ObjectPropertyDomain and ObjectPropertyRange axioms wherever the definition of a property unambiguously identifies the domain or the range of a property.

Move the examples to additional resources/documentation and not in the ontology. Only keep Actuator Appliance Sensor Meter, keep HVAC (maybe remove it in the future, add in the comment that there is a link with saref4bldg).  Remove LightingDevice, remove MicroRenewable, remove Multimedia but create an example about Multimedia. remove Network.

Updated the ontology to use hash URIs

See merge request SAREF/saref-core!28

removed units of measure examples from om ontology

See merge request SAREF/saref-core!27

Fixed some descriptions.

added saref:FeatureOfInterest and saref:measurementMadeBy

Closes #40

See merge request SAREF/saref-core!26

Fixed some descriptions using "feature of interest" instead of "entity".
Removed capitalization of a couple of words in descriptions.

Updated term definitions.

Closes #5

See merge request SAREF/saref-core!24

The property saref:hasDescription is deprecated and the restriction has been removed.

Closes #6

See merge request SAREF/saref-core!22

Fixed documentation of OnState and OffState.

Closes #39

See merge request SAREF/saref-core!25

Removed the conflicting axiom.

Closes #20

See merge request SAREF/saref-core!23

Closes #39.

Closes #5.

Updated the definition of hasValue and the restriction on Measurement.

See merge request SAREF/saref-core!19

Closes #20.

Closes #6.

Added the inverse property.

See merge request SAREF/saref-core!20

Removing the conflicting axiom.

See merge request SAREF/saref-core!21

Updated the definition of EventFunction. Solves issue #18

See merge request SAREF/saref-core!16

Solves #19.

Solves #21.

Solves #24.

Merge branches 'issue-18' and 'issue-18' of https://forge.etsi.org/gitlab/SAREF/saref-core into issue-18

# Conflicts:
#	ontology/saref.ttl