3 Terms, definitions, and conventions

3.3 Conventions used in this document

3.3.4 Common Attributes

3.3.4.1 General

For all Nodes specified in this specification, the Attributes named in Table 3 shall be set as specified in the table.

Table 3 – Common Node Attributes

Attribute	Value
DisplayName	The DisplayName is a LocalizedText. Each server shall provide the DisplayName identical to the BrowseName of the Node for the LocaleId “en”. Whether the server provides translated names for other LocaleIds is vendor specific.
Description	Optionally a vendor specific description is provided
NodeClass	Shall reflect the NodeClass of the Node
NodeId	The NodeId is described by BrowseNames as defined in 3.3.3.1.
WriteMask	Optionally the WriteMask Attribute can be provided. If the WriteMask Attribute is provided, it shall set all Attributes to not writeable that are not said to be vendor-specific. For example, the Description Attribute may be set to writeable since a Server may provide a server-specific description for the Node. The NodeId shall not be writeable, because it is defined for each Node in this specification.
UserWriteMask	Optionally the UserWriteMask Attribute can be provided. The same rules as for the WriteMask Attribute apply.

3.3.4.2 Objects

For all Objects specified in this specification, the Attributes named in Table 4 shall be set as specified in the table.

Table 4 – Common Object Attributes

Attribute	Value
EventNotifier	Whether the Node can be used to subscribe to Events or not is vendor specific

3.3.4.3 Variables

For all Variables specified in this specification, the Attributes named in Table 5 shall be set as specified in the table.

Table 5 – Common Variable Attributes

Attribute	Value
MinimumSamplingInterval	Optionally, a vendor-specific minimum sampling interval is provided
AccessLevel	The access level for Variables used for type definitions is vendor-specific, for all other Variables defined in this part, the access level shall allow a current read; other settings are vendor specific.
UserAccessLevel	The value for the UserAccessLevel Attribute is vendor-specific. It is assumed that all Variables can be accessed by at least one user.
Value	For Variables used as InstanceDeclarations, the value is vendor-specific; otherwise it shall represent the value described in the text.
ArrayDimensions	If the ValueRank does not identify an array of a specific dimension (i.e. ValueRank <= 0) the ArrayDimensions can either be set to null or the Attribute is missing. This behaviour is vendor-specific. If the ValueRank specifies an array of a specific dimension (i.e. ValueRank > 0) then the ArrayDimensions Attribute shall be specified in the table defining the Variable.

3.3.4.4 VariableTypes

For all VariableTypes specified in this specification, the Attributes named in Table 6 shall be set as specified in the table.

Table 6 – Common VariableType Attributes

Attributes	Value
Value	Optionally a vendor-specific default value can be provided
ArrayDimensions	If the ValueRank does not identify an array of a specific dimension (i.e. ValueRank <= 0) the ArrayDimensions can either be set to null or the Attribute is missing. This behaviour is vendor-specific. If the ValueRank specifies an array of a specific dimension (i.e. ValueRank > 0) then the ArrayDimensions Attribute shall be specified in the table defining the VariableType.