UA Part 14: PubSub - A.1 DataType Schema Header Structures

This Structure DataTypeis the abstract base type used to provide OPC UA DataTypedefinitions for an OPC UA Binary encoded byte blob used outside an OPC UA Server AddressSpace.

The DataTypeSchemaHeaderis formally defined in Table A.1.

Table A.1– DataTypeSchemaHeader Structure

Name	Type	Description
DataTypeSchemaHeader	Structure
namespaces	String[]	Defines an array of namespace URIs. The index into the array is referred to as NamespaceIndex. The NamespaceIndexis used in NodeIdsand QualifiedNames, rather than the longer namespace URI. NamespaceIndex 0 is reserved for the OPC UA namespace and it is not included in this array. The array contains the namespaces used in the data that follows the DataTypeSchemaHeader. The index used in NodeIdand QualifiedNamesidentify an element in this list. The first entry in this array maps to NamespaceIndex 1.
structureDataTypes	StructureDescription[]	Description of Structure and Union DataTypesused in the data that follows the DataTypeSchemaHeader. This includes nested Structures. DataType NodeIds for Structure DataTypesused in the data refer to entries in this array. The StructureDescription DataTypeis defined in A.1.3.
enumDataTypes	EnumDescription[]	Description of Enumeration or OptionSet DataTypesused in in the data that follows the DataTypeSchemaHeader. DataType NodeIds for Enumeration or OptionSet DataTypesused in the data refer to entries in this array. The EnumDescription DataTypeis defined in A.1.4.
simpleDataTypes	SimpleTypeDescription[]	Description of DataTypesderived from built-in DataTypes. This excludes OptionSet DataTypes.

The DataTypeSchemaHeader Structurerepresentation in the AddressSpaceis defined in Table A.2.

Table A.2– DataTypeSchemaHeader Definition

Attributes	Value
BrowseName	DataTypeSchemaHeader
IsAbstract	True
References	NodeClass	BrowseName	IsAbstract
Subtype of Structure defined in OPC 10000-5.
HasSubtype	DataType	UABinaryFileDataType	False

A.1.2 DataTypeDescription

This Structure DataTypeis the abstract base type for all DataTypedescriptions containing the DataType NodeIdand the definition for custom DataTypeslike Structures and Enumerations. The DataTypeDescriptionis formally defined in Table A.3.

Table A.3– DataTypeDescription Structure

Name	Type	Description
DataTypeDescription	Structure
dataTypeId	NodeId	The NodeIdof the DataType.
name	QualifiedName	A unique name for the data type.

The DataTypeDescription Structurerepresentation in the AddressSpace is defined in Table A.4.

Table A.4– DataTypeDescription Definition

Attributes	Value
BrowseName	DataTypeDescription
IsAbstract	True
References	NodeClass	BrowseName	IsAbstract
Subtype of Structure defined in OPC 10000-5.
HasSubtype	DataType	StructureDescription	FALSE
HasSubtype	DataType	EnumDescription	FALSE

A.1.3 StructureDescription

This Structure DataTypeprovides the concrete DataTypeDescriptionfor Structure DataTypes. It is a subtype of the DataTypeDescription DataType. The StructureDescriptionis formally defined in Table A.5.

Table A.5– StructureDescription Structure

Name	Type	Description
StructureDescription	Structure
structureDefinition	StructureDefinition	The definition of the structure DataType. The StructureDefinition DataTypeis defined in OPC 10000-3.

Its representation in the AddressSpace is defined in Table A.6.

Table A.6– StructureDescription Definition

Attributes	Value
BrowseName	StructureDescription
IsAbstract	False
Subtype of DataTypeDescription defined in 6.2.2.1.5.

A.1.4 EnumDescription

This Structure DataTypeprovides the concrete DataTypeDescriptionfor Enumeration DataTypes. It is a subtype of the DataTypeDescription DataType. The EnumDescriptionis formally defined in Table A.7.

Table A.7– EnumDescription Structure

Name	Type	Description
EnumDescription	Structure
enumDefinition	EnumDefinition	The definition of the enumeration DataType. The EnumDefinition DataTypeis defined in OPC 10000-3.
builtInType	Byte	The builtInTypeindicates if the DataTypeis an Enumerationor an OptionSet. If the builtInTypeis Int32, the DataTypeis an Enumeration. If the builtInTypeis one of the UInteger DataTypesor ExtensionObject, the DataTypeis an OptionSet.

Its representation in the AddressSpace is defined in Table A.8.

Table A.8– EnumDescription Definition

Attributes	Value
BrowseName	EnumDescription
IsAbstract	False
Subtype of DataTypeDescription defined in 6.2.2.1.5.

A.1.5 SimpleTypeDescription

This Structure DataTypeprovides the information for DataTypesderived from built-in DataTypes. It is a subtype of Structure. The SimpleTypeDescriptionis formally defined in Table A.9.

Table A.9– SimpleTypeDescription Structure

Name	Type	Description
SimpleTypeDescription	Structure
baseDataType	NodeId	The base DataTypeof the simple DataType.
builtInType	Byte	The builtInTypeused for the encoding of the simple DataType.