@base          <http://sensorml.com/ont/isa/property> .
@prefix :      <http://sensorml.com/ont/isa/property/> .
@prefix skos:  <http://www.w3.org/2004/02/skos/core#> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl:   <http://www.w3.org/2002/07/owl#> .
@prefix dct:   <http://purl.org/dc/terms/> .

<>  a  owl:Ontology ;
        rdfs:label          "Integrated Sensor Architecture (ISA) Vocabulary" ;
        rdfs:comment        "Vocabulary of properties used in the Integrated Sensor Architecture Data Models" .

:AC_Current_Load  a  owl:NamedIndividual ;
        rdfs:label          "AC Current Load" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/ElectricCurrent> ;
        skos:definition     "AC current being consumed by the load." .

:AC_Current_Source  a  owl:NamedIndividual ;
        rdfs:label          "AC Current Source" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/ElectricCurrent> ;
        skos:definition     "AC current being produced by the source." .

:AC_Voltage_Load  a  owl:NamedIndividual ;
        rdfs:label          "AC Voltage Load" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/Voltage> ;
        skos:definition     "AC voltage used by the load." .

:AC_Voltage_Source  a  owl:NamedIndividual ;
        rdfs:label          "AC Voltage Source" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/Voltage> ;
        skos:definition     "AC voltage provided by the source." .

:Active  a  owl:NamedIndividual ;
        rdfs:label          "Active" ;
        skos:definition     "When true, this property indicates the device is actively performing it's responsibilities." .

:Armed  a  owl:NamedIndividual ;
        rdfs:label          "Armed" ;
        skos:definition     "Current arming state of the component. The presence of this property within a component indicates that the component needs to be armed before an active command can be invoked. " .

:Attached_Orientation  a  owl:NamedIndividual ;
        rdfs:label          "Attached Orientation" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Orientation> ;
        skos:definition     "For a component that is physically connected to another component (the parent foeld in its Relationship property has a Link value of ATTACHED) the orientation of the component with respect to the parent component's local reference frame. This rotation is applied after the translation from Attached Position using the translated reference frame as the new axes. If a component reports both an Attached Orientation and Orientation that are in conflict, the Orientation will take precedence.  " .

:Attached_Position  a  owl:NamedIndividual ;
        rdfs:label          "Attached Position" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Position> ;
        skos:definition     "For a component that is a physically connected to another component (the parent field in its Relationship property has a Link value of ATTACHED), the position in the parent component's local reference frame. This position is applied before the rotation of Attached Orientation." .

:Auto_Brightness  a  owl:NamedIndividual ;
        rdfs:label          "Auto Brightness" ;
        skos:definition     "Whether an imager's automatic brightness capability is enabled. " .

:Auto_Contrast  a  owl:NamedIndividual ;
        rdfs:label          "Auto Contrast" ;
        skos:definition     "Whether an imager's automatic contrast capability is enabled. " .

:Auto_Focus  a  owl:NamedIndividual ;
        rdfs:label          "Auto Focus" ;
        skos:definition     "Whether an imager's automatic focus capability is enabled. " .

:Auto_Gain  a  owl:NamedIndividual ;
        rdfs:label          "Auto Gain" ;
        skos:definition     "Whether the capability of automatic adjustment to a signal gain is enabled." .

:Auto_Level  a  owl:NamedIndividual ;
        rdfs:label          "Auto Level" ;
        skos:definition     "Whether the capability of automatic level adjustment to pixel values is enabled. " .

:Auto_Scan  a  owl:NamedIndividual ;
        rdfs:label          "Auto Scan" ;
        skos:definition     "Whether the capability of automatic scanning is enabled. " .

:Brightness  a  owl:NamedIndividual ;
        rdfs:label          "Brightness" ;
        skos:definition     "The current brightness level. " .

:Built_In_Test_Result  a  owl:NamedIndividual ;
        rdfs:label          "Built In Test Result" ;
        skos:definition     "The results of the last Built-in-test that was run. " .

:Camera_Mode  a  owl:NamedIndividual ;
        rdfs:label          "Camera Mode" ;
        skos:definition     "Current camera mode of the component. This is mutable only if the camera has more than one supported camera mode. The camera mode gives a rough indication of the frequency range of the camera, indicating its suitability for operation in different environments. If a single camera supports more than one mode, then it's assumed that a switch needs to be made between the modes. Any single device that supports more than one mode simultaneously should be modeled as one component for each mode. " .

:Capability_Version  a  owl:NamedIndividual ;
        rdfs:label          "Capability Version" ;
        skos:definition     "Configuration version for this specific component. This is analogous to a software release number for the component. " .

:Charged  a  owl:NamedIndividual ;
        rdfs:label          "Charged" ;
        skos:definition     "Whether a component is charged. " .

:Contrast  a  owl:NamedIndividual ;
        rdfs:label          "Contrast" ;
        skos:definition     "Current camera contrast as a percentage of maximum. " .

:Crypto_Filled  a  owl:NamedIndividual ;
        rdfs:label          "Crypto Filled" ;
        skos:definition     "Crypto key filled " .

:DC_Current_Load  a  owl:NamedIndividual ;
        rdfs:label          "DC Current Load" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/ElectricCurrent> ;
        skos:definition     "DC current being consumed by the load. " .

:DC_Current_Source  a  owl:NamedIndividual ;
        rdfs:label          "DC Current Source" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/ElectricCurrent> ;
        skos:definition     "DC current being produced by the source. " .

:DC_Voltage_Load  a  owl:NamedIndividual ;
        rdfs:label          "DC Voltage Load" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/Voltage> ;
        skos:definition     "DC voltage used by the load." .

:DC_Voltage_Source  a  owl:NamedIndividual ;
        rdfs:label          "DC Voltage Source" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/Voltage> ;
        skos:definition     "DC voltage provided by the source." .

:Data_Inputs  a  owl:NamedIndividual ;
        rdfs:label          "Data Inputs" ;
        skos:definition     "Data being received by the component. " .

:Data_Outputs  a  owl:NamedIndividual ;
        rdfs:label          "Data Outputs" ;
        skos:definition     "Data being sent by the component. This property is for data that is being transmitted, not for data that is available. To list data that is available for a client to fetch use the Resources property. " .

:Enabled  a  owl:NamedIndividual ;
        rdfs:label          "Enabled" ;
        skos:definition     "When true, this property indicates the device is allowed to become active. " .

:Eye_Safe_Distance  a  owl:NamedIndividual ;
        rdfs:label          "Eye Safe Distance" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/Distance> ;
        skos:definition     "Minimum eye safe distance from the device. " .

:Field_of_Regard  a  owl:NamedIndividual ;
        rdfs:label          "Field of Regard" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/FieldOfView> ;
        skos:definition     "Current field of regard for the camera or component that has a field of regard; it is the total view over the scan time. " .

:Field_of_View  a  owl:NamedIndividual ;
        rdfs:label          "Field of View" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/FieldOfView> ;
        skos:definition     "Current field of view for the camera or component that has a field of view; it is the instantaneous view. " .

:Focus  a  owl:NamedIndividual ;
        rdfs:label          "Focus" ;
        skos:definition     "Current focus level of the component." .

:Frame_Rate  a  owl:NamedIndividual ;
        rdfs:label          "Frame Rate" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/VideoFrameRate> ;
        skos:definition     "Frame rate for video produced by a camera." .

:Frequencies  a  owl:NamedIndividual ;
        rdfs:label          "Frequencies" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/Frequency> ;
        skos:definition     "Set of frequencies being used by an emitting component such as Radar, laser designator, or other component. " .

:Ground_Intercept  a  owl:NamedIndividual ;
        rdfs:label          "Ground Intercept" ;
        skos:definition     "The ground intercept is the geographic position where the component pointing vector intercepts the ground. " .

:Hardware_Version  a  owl:NamedIndividual ;
        rdfs:label          "Hardware Version" ;
        skos:definition     "The version of the hardware being used by the component. " .

:IP_Addresses  a  owl:NamedIndividual ;
        rdfs:label          "IP Addresses" ;
        skos:definition     "The list of IP Addresses associated with the component. The name in the associative array is the name of the interface, the value is the current IP address of that interface. If multiple IP addresses must be assigned to a single interface the plus sign (\"+\") may be used to create subinterfaces. For example, the interface eth0 -> 192.168.1.1, 192.55.1.4 can be listed as eth0+1 -> 192.168.1.1 and eth0+2 -> 192.55.1.4. " .

:Identity  a  owl:NamedIndividual ;
        rdfs:label          "Identity" ;
        skos:definition     "Key aspects of the component using MIL-STD-2525 nomenclature. " .

:Iris_Size  a  owl:NamedIndividual ;
        rdfs:label          "Iris Size" ;
        skos:definition     "Current size of the iris as a percentage of maximum. " .

:Level  a  owl:NamedIndividual ;
        rdfs:label          "Level" ;
        skos:definition     "Level of signal" .

:Link_Loss  a  owl:NamedIndividual ;
        rdfs:label          "Link Loss" ;
        skos:definition     "Signal loss" .

:Link_State  a  owl:NamedIndividual ;
        rdfs:label          "Link State" ;
        skos:definition     "The current state of a network interface. True indicates the interface is up, false indicates the interfaces is down. " .

:Local_Orientation  a  owl:NamedIndividual ;
        rdfs:label          "Local Orientation" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Orientation> ;
        skos:definition     "This property describes a component's rotational offset from its standard position, in its own reference frame. Generally, this should be used for a physical subcomponent to report its own relative orientation with respect to its standard position. This rotation is applied after the Local Position translation, using the translated reference frame as the new axes of rotation. " .

:Local_Position  a  owl:NamedIndividual ;
        rdfs:label          "Local Position" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Location> ;
        skos:definition     "This property describes a component's offset from its standard position, in the component's own reference frame; this offset is applied after the Attached Position offset and the Attached Orientation rotation, and before the Local Orientation. " .

:Maintenance_POC  a  owl:NamedIndividual ;
        rdfs:label          "Maintenance POC" ;
        skos:definition     "The individual or group to contact when maintenance is necessary. " .

:Manufacturer  a  owl:NamedIndividual ;
        rdfs:label          "Manufacturer" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Manufacturer> ;
        skos:definition     "Component manufacturer, producer, or vendor." .

:Manufacturer_POC  a  owl:NamedIndividual ;
        rdfs:label          "Manufacturer POC" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Manufacturer> ;
        skos:definition     "The manufacturer of the component. For backwards compatibility, users should also provide the Manufacturer property." .

:Maximum_Status_Interval  a  owl:NamedIndividual ;
        rdfs:label          "Maximum Status Interval" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Duration> ;
        skos:definition     "The maximum time interval that will elapse between two subsequent sends of a components status. " .

:Minimum_Status_Interval  a  owl:NamedIndividual ;
        rdfs:label          "Minimum Status Interval" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Duration> ;
        skos:definition     "The minimum time interval that must occur between the sending of two subsequent component statuses. Any state changes occuring during the interval must be cached and sent during the next allowed time. " .

:Model  a  owl:NamedIndividual ;
        rdfs:label          "Model" ;
        skos:exactMatch     <http://sensorml.com/ont/swe/property/ModelNumber> ;
        skos:definition     "Model of this component within the manufacturer's product line. " .

:Name  a  owl:NamedIndividual ;
        rdfs:label          "Name" ;
        skos:definition     "A user friendly name for the component. This can be reassigned or changed as needed. " .

:Operating_State  a  owl:NamedIndividual ;
        rdfs:label          "Operating State" ;
        skos:definition     "Current operating state of the component. This is a reflection of the state of the component itself and not the ISA lifecycle state that the component is in. " .

:Orientation  a  owl:NamedIndividual ;
        rdfs:label          "Orientation" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Orientation> ;
        skos:definition     "The orientation of the component with respect to the Earth-Centered Earth-Fixed frame of reference. When using this reference frame the x-axis points toward true north, the y-axis points to the components right, and the z-axis points down along the gravity vector. This orientation is used when the component reports its orientation in reference to world space. If reporting orientation relative to a physical parent the Attached Orientation should be used. If reporting the orientation relative to the component's own home position the Local Orientation should be used. " .

:Owner  a  owl:NamedIndividual ;
        rdfs:label          "Owner" ;
        skos:definition     "The owner of this specific component. " .

:Polarity  a  owl:NamedIndividual ;
        rdfs:label          "Polarity" ;
        skos:definition     "The polarity of an electromagnetic signal" .

:Position  a  owl:NamedIndividual ;
        rdfs:label          "Position" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Location> ;
        skos:definition     "Current position of the component." .

:Power  a  owl:NamedIndividual ;
        rdfs:label          "Power" ;
        skos:definition     "For devices that support variable power, represents the given percentage of the maximum available power. " .

:Power_State  a  owl:NamedIndividual ;
        rdfs:label          "Power State" ;
        skos:definition     "The current state of power to the component. " .

:Program_of_Record_  a  owl:NamedIndividual ;
        rdfs:label          "Program of Record " ;
        skos:definition     "The program of record of the component. " .

:Pulse_Interval  a  owl:NamedIndividual ;
        rdfs:label          "Pulse Interval" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Duration> ;
        skos:definition     "Interval between a laser's pulses." .

:Quality  a  owl:NamedIndividual ;
        rdfs:label          "Quality" ;
        skos:definition     "The quality of the output produced by the component." .

:Radar_Mode  a  owl:NamedIndividual ;
        rdfs:label          "Radar Mode" ;
        skos:definition     "Current radar mode of the component." .

:Range  a  owl:NamedIndividual ;
        rdfs:label          "Range" ;
        skos:definition     "The expected usable range of the component." .

:Receive_Data_Rate  a  owl:NamedIndividual ;
        rdfs:label          "Receive Data Rate" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/DataRate> ;
        skos:definition     "The current receiving data rate of the component." .

:Receive_Power  a  owl:NamedIndividual ;
        rdfs:label          "Receive Power" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/RF-Power> ;
        skos:definition     "The strength of the received signal." .

:Relationship  a  owl:NamedIndividual ;
        rdfs:label          "Relationship" ;
        skos:definition     "Physical relationship between this device and other devices. Useful for determining the absolute position or orientation of a device that may be mounted to another platform. " .

:Reserve_Capacity  a  owl:NamedIndividual ;
        rdfs:label          "Reserve Capacity" ;
        skos:definition     "Current capacity of energy reserve in percent of maximum capacity. This is can be used to report a fuel tank capability or battery level. " .

:Resolution  a  owl:NamedIndividual ;
        rdfs:label          "Resolution" ;
        skos:broadMatch     <http://www.w3.org/ns/ssn/systems/Resolution> ;
        skos:definition     "The resolution of the output produced by the component. " .

:Resources  a  owl:NamedIndividual ;
        rdfs:label          "Resources" ;
        skos:definition     "Accessible resources for obtaining media (streams or otherwise) generated by this component. " .

:Satellites  a  owl:NamedIndividual ;
        rdfs:label          "Satellites" ;
        skos:definition     "The number of satellites in use." .

:Scan_Time  a  owl:NamedIndividual ;
        rdfs:label          "Scan Time" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Duration> ;
        skos:definition     "Time it takes for a scanning device to fully cover its scan area one time. " .

:Serial_Number  a  owl:NamedIndividual ;
        rdfs:label          "Serial Number" ;
        skos:definition     "Unique number assigned to this component within the manufacturer's model line. The triplet (manufacturer, model, serial number) is expected to be globally and universally unique. " .

:Shots  a  owl:NamedIndividual ;
        rdfs:label          "Shots" ;
        skos:definition     "Contains the number of times the laser has been used." .

:Signal_Strength_Ratio  a  owl:NamedIndividual ;
        rdfs:label          "Signal Strength Ratio" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/SignalStrength> ;
        skos:definition     "" .

:Software_Version  a  owl:NamedIndividual ;
        rdfs:label          "Software Version" ;
        skos:exactMatch     <http://sensorml.com/ont/swe/property/SoftwareVersion> ;
        skos:definition     "The version of the software running on the component." .

:Specification_Version  a  owl:NamedIndividual ;
        rdfs:label          "Specification Version" ;
        skos:definition     "ISA specification version with which this component complies." .

:Support_POC  a  owl:NamedIndividual ;
        rdfs:label          "Support POC" ;
        skos:definition     "The individual or group to contact when non-maintenance support is needed. " .

:Time_to_Empty  a  owl:NamedIndividual ;
        rdfs:label          "Time to Empty" ;
        skos:broadMatch     <http://sensorml.com/ont/swe/property/Duration> ;
        skos:definition     "Time to empty based on expected usage." .

:Transmit_Data_Rate  a  owl:NamedIndividual ;
        rdfs:label          "Transmit Data Rate" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/DataRate> ;
        skos:definition     "The current transmitting data rate of the component." .

:Transmit_Power  a  owl:NamedIndividual ;
        rdfs:label          "Transmit Power" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/RF-Power> ;
        skos:definition     "The strength of the produced signal." .

:Velocity  a  owl:NamedIndividual ;
        rdfs:label          "Velocity" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/LinearVelocity> ;
        skos:definition     "Absolute velocity of the device." .

:View_Area  a  owl:NamedIndividual ;
        rdfs:label          "View Area" ;
        skos:definition     "The area that is currently in view. For example, the physical area a camera is able to view. " .

:Visible  a  owl:NamedIndividual ;
        rdfs:label          "Visible" ;
        skos:definition     "When the laser is in the visible spectrum this is set to true" .

:Wavelengths  a  owl:NamedIndividual ;
        rdfs:label          "Wavelengths" ;
        skos:definition     "The wavelengths used by the laser" .

:Zones  a  owl:NamedIndividual ;
        rdfs:label          "Zones" ;
        skos:definition     "Full ordered list of inclusion and exclusion areas from the component. The ordering of the list allows for the nesting inclusion and exclusion zones to provide very detailed control over areas the component will include and exclude. " .

:Zoom  a  owl:NamedIndividual ;
        rdfs:label          "Zoom" ;
        skos:definition     "Current zoom level of the camera as a percentage of its maximum" .

:Area  a  owl:NamedIndividual ;
        rdfs:label          "Area" ;
        skos:definition     "Absolute position or geographic area of the observation. " .

:Atmospheric_Humidity  a  owl:NamedIndividual ;
        rdfs:label          "Atmospheric Humidity" ;
        skos:broadMatch     <http://mmisw.org/ont/cf/parameter/relative_humidity> ;
        skos:definition     "Measured atmospheric humidity at the observation position. If the Position observable is not present, the observation position is the position of the observing component. " .

:Atmospheric_Pressure  a  owl:NamedIndividual ;
        rdfs:label          "Atmospheric Pressure" ;
        skos:broadMatch     <http://mmisw.org/ont/cf/parameter/air_pressure> ;
        skos:definition     "Measured atmospheric pressure at the observation position. If the Position observable is not present, the observation position is the position of the observing component. " .

:Atmospheric_Temperature  a  owl:NamedIndividual ;
        rdfs:label          "Atmospheric Temperature" ;
        skos:broadMatch     <http://mmisw.org/ont/cf/parameter/air_temperature> ;
        skos:definition     "Measured atmospheric temperature at the observation position. If the Position observable is not present, the observation position is the position of the observing component. " .

:Atmospheric_Wind  a  owl:NamedIndividual ;
        rdfs:label          "Atmospheric Wind" ;
        skos:broadMatch     <http://mmisw.org/ont/cf/parameter/wind_speed> ;
        skos:definition     "Measured atmospheric wind at the observation position. If the Position observable is not present, the observation position is the position of the observing component. " .

:BSO  a  owl:NamedIndividual ;
        rdfs:label          "BSO" ;
        skos:definition     "Unique identifier assigned to a confirmed or suspected entity on the battlefield. " .

:Bearing  a  owl:NamedIndividual ;
        rdfs:label          "Bearing" ;
        skos:exactMatch     <http://sensorml.com/ont/swe/property/RelativeBearing> ;
        skos:definition     "Rotation from the current orientation of the observing component to the observed entity. " .

:Biological_Reading  a  owl:NamedIndividual ;
        rdfs:label          "Biological Reading" ;
        skos:definition     "Information regarding a detected biological agent." .

:Chemical_Reading  a  owl:NamedIndividual ;
        rdfs:label          "Chemical Reading" ;
        skos:definition     "Information regarding a detected chemical agent." .

:Comment  a  owl:NamedIndividual ;
        rdfs:label          "Comment" ;
        skos:definition     "Human-readable comment about the observation." .

:Distance  a  owl:NamedIndividual ;
        rdfs:label          "Distance" ;
        skos:definition     "Distance from the observing component to the observed entity." .

:Identity  a  owl:NamedIndividual ;
        rdfs:label          "Identity" ;
        skos:definition     "Standardized identifier that describes the observed entity." .

:Media  a  owl:NamedIndividual ;
        rdfs:label          "Media" ;
        skos:definition     "Description of the resource(s) that was generated for, or are otherwise relevant to, the observation. Examples of resources are video, audio, images, text files and raw data files. " .

:Method  a  owl:NamedIndividual ;
        rdfs:label          "Method" ;
        skos:definition     "The primary method used to generate this event. Suggested options include: \"MANUAL\", \"ATR_V\", \"ATR_T\", \"MAGNETIC\", \"ACOUSTIC\", \"FUSION\", \"RADAR\", and \"LIDAR\". " .

:Radiation_Reading  a  owl:NamedIndividual ;
        rdfs:label          "Radiation Reading" ;
        skos:definition     "Information regarding detected radiation." .

:Recall  a  owl:NamedIndividual ;
        rdfs:label          "Recall" ;
        skos:definition     "Human-readable reason that the Event message referenced in the Event Reference field is being recalled. The presence of the Recall observable indicates that the publisher of this Event message wishes to recall the referenced Event message. " .

:Resolve  a  owl:NamedIndividual ;
        rdfs:label          "Resolve" ;
        skos:definition     "The human readable reason that the referenced event is being resolved." .

:Solar_Radiation  a  owl:NamedIndividual ;
        rdfs:label          "Solar Radiation" ;
        skos:broadMatch     <https://mmisw.org/ont/cf/parameter/solar_irradiance> ;
        skos:definition     "Measured solar radiation at the observation position. If the Position observable is not present, the observation position is the position of the observing component. " .

:Velocity  a  owl:NamedIndividual ;
        rdfs:label          "Velocity" ;
        skos:broadMatch     <http://qudt.org/vocab/quantitykind/LinearVelocity> ;
        skos:definition     "Absolute velocity of the entity at the point at which it was observed." .

:Verified_By  a  owl:NamedIndividual ;
        rdfs:label          "Verified By" ;
        skos:definition     "Identity of the person who verified the accuracy of the contents of the Event message in which this observable is contained. " .