Data type kinds

Data types can be of several different kinds: enumeration, opaque, primitive, sequence, or structured. You can determine the kind of data type you are dealing with either by testing it actual type, or using its Kind Property.

The following table describes the data type kinds available, and their associated concrete data type classes.

DataTypeKind member	Associated data type class
Enumeration	EnumerationDataType Class
Opaque	OpaqueDataType Class
Primitive	PrimitiveDataType Class
Sequence	SequenceDataType Class
Structured	StructuredDataType Class
Union	UnionDataType Class

In data type dictionary model (the only model before OPC UA 1.04), union data is not directly available. A union can, however, be quite efficiently modeled using an appropriately formed structure with optional fields.

For each kind of data type, there is also an associated generic data class. See Generic data kinds for more details.

Here you will find more information to the specific data type kinds:

The following class diagram shows the data type classes and their relevant members:

Reference

Kind Property

DataTypeKind Enumeration

EnumerationDataType Class

OpaqueDataType Class

PrimitiveDataType Class

SequenceDataType Class

StructuredDataType Class

UnionDataType Class

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Reference