UA Part 5: Information Model - 7 Standard VariableTypes

Errata exists for this version of the document.

Typically, the components of a complex VariableType are fixed and can be extended by subtyping. However, because each Variable of a VariableType can be extended with additional components this standard allows the extension of the standard VariableTypes defined in this document with additional components. This allows the expression of additional information in the type definition that would be contained in each Variable anyway. However, it is not allowed to restrict the components of the standard VariableTypes defined in this International Standard. An example of extending VariableTypes would be putting the standard Property NodeVersion, defined in OPC 10000-3, into the BaseDataVariableType, stating that each DataVariable of the Server will provide a NodeVersion.

7.2 BaseVariableType

The BaseVariableType is the abstract base type for all other VariableTypes. However, only the PropertyType and the BaseDataVariableType directly inherit from this type.

There are no References, except for HasSubtype References, specified for this VariableType. It is formally defined in Table 61.

Table 61 – BaseVariableType Definition

Attribute		Value
BrowseName		BaseVariableType
IsAbstract		True
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
HasSubtype	VariableType		PropertyType	Defined in 7.3
HasSubtype	VariableType		BaseDataVariableType	Defined in 7.4

7.3 PropertyType

The PropertyType is a subtype of the BaseVariableType. It is used as the type definition for all Properties. Properties are defined by their BrowseName and therefore they do not need a specialised type definition. It is not allowed to subtype this VariableType.

There are no References specified for this VariableType. It is formally defined in Table 62.

Table 62 – PropertyType Definition

Attribute		Value
BrowseName		PropertyType
IsAbstract		False
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseVariableType defined in 7.2.

7.4 BaseDataVariableType

The BaseDataVariableType is a subtype of the BaseVariableType. It is used as the type definition whenever there is a DataVariable having no more concrete type definition available. This VariableType is the base VariableType for VariableTypes of DataVariables, and all other VariableTypes of DataVariables shall either directly or indirectly inherit from it. However, it might not be possible for Servers to provide all HasSubtype References from this VariableType to its subtypes, and therefore it is not required to provide this information.

There are no References except for HasSubtype References specified for this VariableType. It is formally defined in Table 63.

Table 63 – BaseDataVariableType Definition

Attribute		Value
BrowseName		BaseDataVariableType
IsAbstract		False
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		BrowseName	Comment
Subtype of the BaseVariableType defined in 7.2.
HasSubtype	VariableType		ServerVendorCapabilityType	Defined in 7.5
HasSubtype	VariableType		ServerStatusType	Defined in 7.6
HasSubtype	VariableType		BuildInfoType	Defined in 7.7
HasSubtype	VariableType		ServerDiagnosticsSummaryType	Defined in 7.8
HasSubtype	VariableType		SamplingIntervalDiagnosticsArrayType	Defined in 7.9
HasSubtype	VariableType		SamplingIntervalDiagnosticsType	Defined in 7.10
HasSubtype	VariableType		SubscriptionDiagnosticsArrayType	Defined in 7.11
HasSubtype	VariableType		SubscriptionDiagnosticsType	Defined in 7.12
HasSubtype	VariableType		SessionDiagnosticsArrayType	Defined in 7.13
HasSubtype	VariableType		SessionDiagnosticsVariableType	Defined in 7.14
HasSubtype	VariableType		SessionSecurityDiagnosticsArrayType	Defined in 7.15
HasSubtype	VariableType		SessionSecurityDiagnosticsType	Defined in 7.16
HasSubtype	VariableType		OptionSetType	Defined in 7.17

7.5 ServerVendorCapabilityType

This VariableType is an abstract type whose subtypes define capabilities of the Server. Vendors may define subtypes of this type. This VariableType is formally defined in Table 64.

Table 64 – ServerVendorCapabilityType Definition

Attribute		Value
BrowseName		ServerVendorCapabilityType
IsAbstract		True
ValueRank		−1 (−1 = Scalar)
DataType		BaseDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.

7.6 ServerStatusType

This complex VariableType is used for information about the Server status. Its DataVariables reflect its DataType having the same semantic defined in 12.10. The VariableType is formally defined in Table 65.

Table 65 – ServerStatusType Definition

Attribute		Value
BrowseName		ServerStatusType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		ServerStatusDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		StartTime	UtcTime	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentTime	UtcTime	BaseDataVariableType	Mandatory
HasComponent	Variable		State	ServerState	BaseDataVariableType	Mandatory
HasComponent	Variable		BuildInfo1	BuildInfo	BuildInfoType	Mandatory
HasComponent	Variable		SecondsTillShutdown	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		ShutdownReason	LocalizedText	BaseDataVariableType	Mandatory
NOTE Containing Objects and Variables of these Objects and Variables are defined by their BrowseName defined in the corresponding TypeDefinitionNode. The NodeId is defined by the composed symbolic name described in 4.1.

7.7 BuildInfoType

This complex VariableType is used for information about the Server status. Its DataVariables reflect its DataType having the same semantic defined in 12.4. The VariableType is formally defined in Table 66.

Table 66 – BuildInfoType Definition

Attribute		Value
BrowseName		BuildInfoType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		BuildInfo
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		ProductUri	String	BaseDataVariableType	Mandatory
HasComponent	Variable		ManufacturerName	String	BaseDataVariableType	Mandatory
HasComponent	Variable		ProductName	String	BaseDataVariableType	Mandatory
HasComponent	Variable		SoftwareVersion	String	BaseDataVariableType	Mandatory
HasComponent	Variable		BuildNumber	String	BaseDataVariableType	Mandatory
HasComponent	Variable		BuildDate	UtcTime	BaseDataVariableType	Mandatory

7.8 ServerDiagnosticsSummaryType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType having the same semantic defined in 12.9. The VariableType is formally defined in Table 67.

Table 67 – ServerDiagnosticsSummaryType Definition

Attribute		Value
BrowseName		ServerDiagnosticsSummaryType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		ServerDiagnosticsSummaryDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		ServerViewCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CumulatedSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SecurityRejectedSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RejectedSessionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SessionTimeoutCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SessionAbortCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishingIntervalCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentSubscriptionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CumulatedSubscriptionCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		SecurityRejectedRequestsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RejectedRequestsCount	UInt32	BaseDataVariableType	Mandatory

7.9 SamplingIntervalDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array, instances of this type will provide a Variable of the SamplingIntervalDiagnosticsType VariableType having the sampling rate as BrowseName. The VariableType is formally defined in Table 68.

Table 68 – SamplingIntervalDiagnosticsArrayType Definition

Attribute		Value
BrowseName		SamplingIntervalDiagnosticsArrayType
IsAbstract		False
ValueRank		1 (1 = OneDimension)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		SamplingIntervalDiagnosticsDataType
References	NodeClass	BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SamplingIntervalDiagnostics	SamplingIntervalDiagnosticsDataType SamplingIntervalDiagnosticsType	ExposesItsArray

7.10 SamplingIntervalDiagnosticsType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.8. The VariableType is formally defined in Table 69.

Table 69 – SamplingIntervalDiagnosticsType Definition

Attribute			Value
BrowseName			SamplingIntervalDiagnosticsType
IsAbstract			False
ValueRank			−1 (−1 = Scalar)
DataType			SamplingIntervalDiagnosticsDataType
References	NodeClass	BrowseName		DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SamplingInterval		Duration	BaseDataVariableType	Mandatory
HasComponent	Variable	SampledMonitoredItemsCount		UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable	MaxSampledMonitoredItemsCount		UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable	DisabledMonitoredItemsSamplingCount		UInt32	BaseDataVariableType	Mandatory

7.11 SubscriptionDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array, instances of this type will provide a Variable of the SubscriptionDiagnosticsType VariableType having the SubscriptionId as BrowseName. The VariableType is formally defined in Table 70.

Table 70 – SubscriptionDiagnosticsArrayType Definition

Attribute			Value
BrowseName			SubscriptionDiagnosticsArrayType
IsAbstract			False
ValueRank			1 (1 = OneDimension)
ArrayDimensions			{0} (0 = UnknownSize)
DataType			SubscriptionDiagnosticsDataType
References	NodeClass	BrowseName		DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SubscriptionDiagnostics		SubscriptionDiagnosticsDataType SubscriptionDiagnosticsType	ExposesItsArray

7.12 SubscriptionDiagnosticsType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.15. The VariableType is formally defined in Table 71.

Table 71 – SubscriptionDiagnosticsType Definition

Attribute		Value
BrowseName		SubscriptionDiagnosticsType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		SubscriptionDiagnosticsDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionId	NodeId	BaseDataVariableType	Mandatory
HasComponent	Variable		SubscriptionId	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		Priority	Byte	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishingInterval	Duration	BaseDataVariableType	Mandatory
HasComponent	Variable		MaxKeepAliveCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MaxLifetimeCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MaxNotificationsPerPublish	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishingEnabled	Boolean	BaseDataVariableType	Mandatory
HasComponent	Variable		ModifyCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		EnableCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DisableCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishMessageRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		RepublishMessageCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		TransferRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		TransferredToAltClientCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		TransferredToSameClientCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		PublishRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DataChangeNotificationsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		EventNotificationsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		NotificationsCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		LatePublishRequestCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentKeepAliveCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		CurrentLifetimeCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		UnacknowledgedMessageCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DiscardedMessageCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MonitoredItemCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		DisabledMonitoredItemCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		MonitoringQueueOverflowCount	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		NextSequenceNumber	UInt32	BaseDataVariableType	Mandatory
HasComponent	Variable		EventQueueOverflowCount	UInt32	BaseDataVariableType	Mandatory

7.13 SessionDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array instances of this type will provide a Variable of the SessionDiagnosticsVariableType VariableType, having the SessionDiagnostics as BrowseName. Those Variables will also be referenced by the SessionDiagnostics Objects defined by their type in 6.3.5. The VariableType is formally defined in Table 72.

Table 72 – SessionDiagnosticsArrayType Definition

Attribute		Value
BrowseName		SessionDiagnosticsArrayType
IsAbstract		False
ValueRank		1 (1 = OneDimension)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		SessionDiagnosticsDataType
References	NodeClass		BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionDiagnostics	SessionDiagnosticsDataType SessionDiagnosticsVariableType		ExposesItsArray

7.14 SessionDiagnosticsVariableType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.11. The VariableType is formally defined in Table 73.

Table 73 – SessionDiagnosticsVariableType Definition

Attribute		Value
BrowseName		SessionDiagnosticsVariableType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		SessionDiagnosticsDataType
References	NodeClass	BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable	SessionId	NodeId BaseDataVariableType	Mandatory
HasComponent	Variable	SessionName	String BaseDataVariableType	Mandatory
HasComponent	Variable	ClientDescription	ApplicationDescription BaseDataVariableType	Mandatory
HasComponent	Variable	ServerUri	String BaseDataVariableType	Mandatory
HasComponent	Variable	EndpointUrl	String BaseDataVariableType	Mandatory
HasComponent	Variable	LocaleIds	LocaleId[] BaseDataVariableType	Mandatory
HasComponent	Variable	MaxResponseMessageSize	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable	ActualSessionTimeout	Duration BaseDataVariableType	Mandatory
HasComponent	Variable	ClientConnectionTime	UtcTime BaseDataVariableType	Mandatory
HasComponent	Variable	ClientLastContactTime	UtcTime BaseDataVariableType	Mandatory
HasComponent	Variable	CurrentSubscriptionsCount	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable	CurrentMonitoredItemsCount	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable	CurrentPublishRequestsInQueue	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable	TotalRequestCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	UnauthorizedRequestCount	UInt32 BaseDataVariableType	Mandatory
HasComponent	Variable	ReadCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	HistoryReadCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	WriteCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	HistoryUpdateCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	CallCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	CreateMonitoredItemsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	ModifyMonitoredItemsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	SetMonitoringModeCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	SetTriggeringCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	DeleteMonitoredItemsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	CreateSubscriptionCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	ModifySubscriptionCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	SetPublishingModeCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	PublishCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	RepublishCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	TransferSubscriptionsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	DeleteSubscriptionsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	AddNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	AddReferencesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	DeleteNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	DeleteReferencesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	BrowseCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	BrowseNextCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	TranslateBrowsePathsToNodeIdsCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	QueryFirstCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	QueryNextCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	RegisterNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory
HasComponent	Variable	UnregisterNodesCount	ServiceCounterDataType BaseDataVariableType	Mandatory

7.15 SessionSecurityDiagnosticsArrayType

This complex VariableType is used for diagnostic information. For each entry of the array instances of this type will provide a Variable of the SessionSecurityDiagnosticsType VariableType, having the SessionSecurityDiagnostics as BrowseName. Those Variables will also be referenced by the SessionDiagnostics Objects defined by their type in 6.3.5. The VariableType is formally defined in Table 74. Since this information is security related, it should not be made accessible to all users, but only to authorised users.

Table 74 – SessionSecurityDiagnosticsArrayType Definition

Attribute		Value
BrowseName		SessionSecurityDiagnosticsArrayType
IsAbstract		False
ValueRank		1 (1 = OneDimension)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		SessionSecurityDiagnosticsDataType
References	NodeClass		Browse Name	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4.
HasComponent	Variable		SessionSecurityDiagnostics	SessionSecurityDiagnosticsDataType SessionSecurityDiagnosticsType	ExposesItsArray

7.16 SessionSecurityDiagnosticsType

This complex VariableType is used for diagnostic information. Its DataVariables reflect its DataType, having the same semantic defined in 12.12. The VariableType is formally defined in Table 75. Since this information is security-related, it should not be made accessible to all users, but only to authorised users.

Table 75 – SessionSecurityDiagnosticsType Definition

Attribute		Value
BrowseName		SessionSecurityDiagnosticsType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		SessionSecurityDiagnosticsDataType
References	NodeClass		BrowseName	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasComponent	Variable		SessionId	NodeId BaseDataVariableType	Mandatory
HasComponent	Variable		ClientUserIdOfSession	String BaseDataVariableType	Mandatory
HasComponent	Variable		ClientUserIdHistory	String[] BaseDataVariableType	Mandatory
HasComponent	Variable		AuthenticationMechanism	String BaseDataVariableType	Mandatory
HasComponent	Variable		Encoding	String BaseDataVariableType	Mandatory
HasComponent	Variable		TransportProtocol	String BaseDataVariableType	Mandatory
HasComponent	Variable		SecurityMode	MessageSecurityMode BaseDataVariableType	Mandatory
HasComponent	Variable		SecurityPolicyUri	String BaseDataVariableType	Mandatory
HasComponent	Variable		ClientCertificate	ByteString BaseDataVariableType	Mandatory

7.17 OptionSetType

The OptionSetType VariableType is used to represent a bit mask. Each array element of the OptionSetValues Property contains either the human-readable representation for the corresponding bit used in the option set or an empty LocalizedText for a bit that has no specific meaning. The order of the bits of the bit mask maps to a position of the array, i.e. the first bit (least significant bit) maps to the first entry in the array, etc.

In addition to this VariableType, the DataType OptionSet can alternatively be used to represent a bit mask. As a guideline the DataType would be used when the bit mask is fixed and applies to several Variables. The VariableType would be used when the bit mask is specific for only that Variable.

The DataType of this VariableType shall be capable of representing a bit mask. It shall be either a numeric DataType representing a signed or unsigned integer, or a ByteString. For example, it can be the BitFieldMaskDataType.

The optional BitMask Property provides the bit mask in an array of Booleans. This allows subscribing to individual entries of the bit mask. The order of the bits of the bit mask points to a position of the array, i.e. the first bit points to the first entry in the array, etc. The VariableType is formally defined in Table 74.

Table 76 – OptionSetType Definition

Attribute		Value
BrowseName		OptionSetType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
ArrayDimensions		{0} (0 = UnknownSize)
DataType		BaseDataType
References	NodeClass		Browse Name	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		OptionSetValues	LocalizedText[] PropertyType	Mandatory
HasProperty	Variable		BitMask	Boolean[] PropertyType	Optional

7.18 SelectionListType

The SelectionListType VariableType is used for a Variable where the possible values are provided by a set of values.

The Selections Property contains an array of values which represent valid values for this VariableType’s value.

The DataType of the Selections Property array shall be of the same DataType as this VariableType.

Each array element of the optional SelectionDescriptions Property contains a human-readable representation of the corresponding value in the Selections Property and shall be of the same array size as the Selections Property.

The value of this VariableType may be restricted to only the values defined in the Selections Property by setting the optional RestrictToList Property to a value of True. If the RestrictToList Property is not present or has a value of False then the value is not restricted to the set defined by the Selections Property.

The VariableType is formally defined in Table 77.

Table 77 – SelectionListType Definition

Attribute		Value
BrowseName		SelectionListType
IsAbstract		False
ValueRank		−2 (−2 = Any)
DataType		BaseDataType
References	NodeClass		Browse Name	DataType TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		Selections	BaseDataType[] PropertyType	Mandatory
HasProperty	Variable		SelectionDescriptions	LocalizedText[] PropertyType	Optional
HasProperty	Variable		RestrictToList	Boolean PropertyType	Optional

7.19 AudioVariableType

The AudioVariableType VariableType defines a Multipurpose Internet Mail Extensions (MIME) media type of the AudibleSound Property. This standard recommends use of text code defined in IETF RFC 2045, IETF RFC 2046 and IETF RFC 2047 for MIME types. The AudioVariableType references the Content-Type that is defined as part of the MIME type and commonly used as a reference to a specific MIME. The top-level media type is used to declare the general type of data, while the subtype specifies a specific format for that type of data. Thus, a media type of "audio /xyz" is a sufficient description for a user agent to determine the data is an audio file, even if the user agent has no knowledge of the specific audio format "xyz".

The VariableType is formally defined in Table 78.

Table 78 – AudioVariableType Definition

Attribute		Value
BrowseName		AudioVariableType
IsAbstract		False
ValueRank		−1 (−1 = Scalar)
DataType		AudioDataType
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		ListId	String	PropertyType	Optional
HasProperty	Variable		AgencyId	String	PropertyType	Optional
HasProperty	Variable		VersionId	String	PropertyType	Optional