Delivery Context Ontology

1.1.1 Disjoint Classes

The ontology contains a large number of disjoint classes. OWL-DL requires explicit definition of each disjoint relationship between classes. The number of such definitions becomes unmanageably large in ontololgies with a large number of classes.

Fortunately, there is an alternative mechanism for ensuring that classes are considered disjoint, without requiring the use of explicit statements. The mechanism relies on each class including a property that has a unique value. In this ontology, the property used is called deliveryContextEntityName. Each class derived from DeliveryContextEntity includes this property. Each class has a unique value for this property. The mechanism is referenced in the OWL Guide[OWL] in the discussion on disjoint classes. An illustration of the technique appears in [OWL-Test] in the section on Positive Entailment Test.

1.2.1 Conformance Information

1.3.1 Reading the Property Tables

Each class in the ontology is associated with a set of properties. These properties are defined in tables in the appropriate section of the specification. Each row in a table defines a single property in terms of a number of fields. The fields used in these tables are described as follows:

Name

This field contains the formal name of the property within the class.

Type

This field contains the type of the property. Datatype properties have types that are not themselves classes. Examples include xsd:int, xsd:boolean, xsd:string and xsd:float. Object properties have types that are classes. Usually these classes are themselves defined in the ontology.

Description

This field contains a description of the property.

Restriction(s)

This field contains restrictions about the property, including:

• Cardinality of the property. The number of occurences of the property within the class is shown as an expression. If there is no expression it means that the property can have any number of instances, including 0. For example, the expression ≥ 0 and ‰¤ 1 indicates that a property is optional and if defined can only occur one time i.e. can only have one value. It's cardinality is 0 or 1. Similarly, the expression =1 indicates that a property always occurs exactly once.

• Values that apply across every instance of a class. Some property values are fixed for every instance of a class. Where this is the case, the value is prefixed by the phrase Class Value(s):. For example, every instance of the class Meters, which represents a physical length in meters, has a unitName property with the value "meter". Some properties can hold values from a specific, predefined set. Where this is the case is prefixed by the phrase Values of:. For example, the Orientation class, which represents the orientation of features such as displays or cameras, has an orientationValue property which can take only the values 0, 90, 180 or 270.

• If the property is functional i.e. its cardinality can only be zero or one (≥ 0 and ‰¤ 1). In other words if a functional property has more than one value an OWL reasoner will treat those values as the same instance. Where this is the case, the value is prefixed by the phrase Functional

Subproperty(ies)

This field defines the subproperties of a property.

1.3.2 Reading the Example Tables

Examples are given for specific classes in the specification. The associated tables contain one or more example classes, complete with values for each of their properties. The fields used in these tables are described as follows:

Example Instance

This field contains the identification of the instance that provides the example.

Property Name

This field contains the formal name of the property whose value is shown as part of the example.

Type

This field contains the type of the property in the example. Datatype properties have types that are not themselves classes. Examples include xsd:int, xsd:boolean, xsd:string and xsd:float. Object properties have types that are classes. Usually these classes are themselves defined in the ontology.

Value(s)

This field contains the value(s) of the property. Where a property has a cardinality of >1, multiple values may be shown in the example.

3.1.1 Geographical Coordinate Reference System

This class represents a geographical coordinate system

Properties of the Geographical Coordinate Reference System Class

Name	Type	Description	Restriction(s)
name	xsd:string	The name of a delivery context entity	Functional = 1

Geographical Coordinate Reference System Examples

3.1.2 Geographical Coordinates

This class represents geographical coordinates that allow to locate precisely a point on the Earth surface

Properties of the Geographical Coordinates Class

Name	Type	Description	Restriction(s)
datum	xsd:string	The datum that express the reference of the coordinates	Functional
geoReferenceSystem	GeoCoordinateRS	This property represents the reference system in which are expressed the geographical coordinates	= 1

3.1.3 Location

This class represents all the location information about something

Properties of the Location Class

Name	Type	Description	Restriction(s)
currentPosition	Point	The current position that will need to be determined by the location provider	Functional
lastKnownPosition	Point	The last known position as reported by the location provider
locationTimestamp	xsd:dateTime	A timestamp that indicates when it was performed the last location request to the location provider. The value of this property can be used to determine if applications need to ask about the last known position or the current position	Functional

Location Examples

3.1.4 Location Method

It represents an specific mechanism used to calculate the location of a thing

Properties of the Location Method Class

Name	Type	Description	Restriction(s)
name	xsd:string	The name of a delivery context entity	Functional = 1

3.1.5 Location Provider

Represents an entity capable of providing location information

Properties of the Location Provider Class

Name	Type	Description	Restriction(s)
activeGeoCoordinateRS	GeoCoordinateRS	Indicates what is the active geographical coordinate system	Functional = 1
estimatedPosition	Point	The estimated position provided by a location provider	Functional
horizontalAccuracy	xsd:int	Stimate of the horizontal accuracy of the location in metres	Functional
locationCostsMoney	xsd:boolean	This property indicates whether the location provider has a cost for the user	Functional
locationFeatures	LocationProviderFeature	The location features supported by the location provider
locationMethod	LocationMethod	The location method used by a LocationProvider for determining the current location associated to the delivery context	Functional ≥ 1
supportedGeoCoordinateRS	GeoCoordinateRS	Indicates what are goegraphical coordinate systems supported by the location provider	≥ 1
typicalResponseTime	xsd:int	This property represents the typical response time in seconds of a location provider from the instant in which the location is requested to the moment in which the location is returned	Functional
verticalAccuracy	xsd:int	Stimate of the vertical accuracy of the location in metres	Functional

Location Provider Examples

3.1.6 Location Provider Feature

This class represents location provider features

Location Provider Feature Examples

3.1.7 Location Provider Support

This class represents location provider support

Properties of the Location Provider Support Class

Name	Type	Description	Restriction(s)
availableLocationProviders	LocationProvider	This property represents the LocationProviders that are currently available in the Delivery Context
supportedLocationProviders	LocationProvider	This property is a list of the supported LocationProviders in a Delivery Context	≥ 1

Location Provider Support Examples

3.1.8 Place

This class represents all the information about the current location associated with the current Delivery Context

Properties of the Place Class

Name	Type	Description	Restriction(s)
location	Location	The location information about the place corresponding to this delivery context	Functional

Place Examples

3.1.9 Point

This class represents a point on the Earth surface

Properties of the Point Class

Name	Type	Description	Restriction(s)	Subproperty(ies)
coordinates	GeoCoordinates	The coordinates of a point	= 1	utmCoordinates wgs84Coordinates
utmCoordinates	UTMCoordinates	Coordinates of a point expressed in the UTM reference system	Functional
wgs84Coordinates	WGS84Coordinates	Coordinates of a point expressed in the WGS84 reference system	Functional

Point Examples

3.2.1 Bearer Type

This class represents bearer types

Properties of the Bearer Type Class

Name	Type	Description	Restriction(s)
alternativeNames	xsd:string	The alternative names of a Delivery Context Entity
name	xsd:string	The name of a delivery context entity	Functional = 1

Bearer Type Examples

3.2.2 Mobile Network

A mobile network that supports several network bearers

Properties of the Mobile Network Class

Name	Type	Description	Restriction(s)
name	xsd:string	The name of a delivery context entity	Functional = 1
networkIdentifier	xsd:string	The identifier of a mobile network	Functional = 1

Mobile Network Examples

3.2.3 Network Bearer

This class represents a network bearer in a delivery context.

Properties of the Network Bearer Class

Name	Type	Description	Restriction(s)
addressType	xsd:string	This property identifies the type of address associated with a bearer.	Functional
bearerNetwork	MobileNetwork	The actual network of a NetworkBearer	Functional
bearerType	BearerType	This property holds the type of the network bearer.	Functional = 1
networkMode	NetworkMode	The network operation characteristics of a network bearer	Functional = 1

Network Bearer Examples

3.2.4 Network Environment

This class represents the network environment present in a delivery context

Properties of the Network Environment Class

Name	Type	Description	Restriction(s)
availableNetworkBearers	AvailableNetworkBearer	The available network bearers in this environment
cellIdentifier	xsd:string	The id of the cell to which the device is interacting with in the mobile network	Functional
operatingNetworkBearer	AvailableNetworkBearer	The network bearer that it is operative in this delivery context	Functional = 1

Network Environment Examples

3.2.5 Newtwork Mode

A mode of operation of a network which includes a network type and operation frequency bands

Properties of the Newtwork Mode Class

Name	Type	Description	Restriction(s)
networkType	NetworkType	The type of network	Functional = 1
operationBands	xsd:long	The frequencies of operation of a device in a network. Frequencies are expressed in Mhz	≥ 1

Newtwork Mode Examples

3.2.6 Network Support

This class represents the network in a delivery context

Properties of the Network Support Class

Name	Type	Description	Restriction(s)
activeNetworkBearer	AvailableNetworkBearer	This property represents the currently active network bearer on a device	Functional
homeNetwork	MobileNetwork	The home network of a device	Functional
supportedNetworkBearers	NetworkBearer	This property holds the set of network bearers supported by the device.	≥ 1
supportedNetworkModes	NetworkMode	The supported network modes of a device	≥ 1

Network Support Examples

3.2.7 Network Type

This class represents different network types

Properties of the Network Type Class

Name	Type	Description	Restriction(s)
alternativeNames	xsd:string	The alternative names of a Delivery Context Entity
name	xsd:string	The name of a delivery context entity	Functional = 1

Network Type Examples