Hello,
OPC UA has built-in types (usually atomic), and then structured types. Some structured types are defined in the standard. And, the server can define its own types too (usually structured types).
So, the types you are seeing are
also valid types. They are complex (structured) data types defined by the particular server.
reference.opcfoundation.org/Core/Part3/v105/docs/8
The built-in types are all in namespace 0, and have specific numeric node Id with low numbers. Ids of all types from the specification are in the UADataTypeIds class. And the integer codes are actually also identical with following enumeration:
Code:
[ComVisible(true)]
[Description("OPC-UA built-in type.")]
[Designable]
[DisplayName2("OPC-UA Built-In Type")]
[Guid("56090438-D3B2-4BE0-A723-85576884EC55")]
public enum UABuiltInType
{
/// <summary>
/// An invalid or unspecified value. Enum value is 0.
/// </summary>
[Description("An invalid or unspecified value. Enum value is 0.")]
Null = 0,
/// <summary>
/// A boolean logic value (true or false). Enum value is 1.
/// </summary>
[Description("A boolean logic value (true or false). Enum value is 1.")]
Boolean = 1,
/// <summary>
/// An 8 bit signed integer value. Enum value is 2.
/// </summary>
[Description("An 8 bit signed integer value. Enum value is 2.")]
SByte = 2,
/// <summary>
/// An 8 bit unsigned integer value. Enum value is 3.
/// </summary>
[Description("An 8 bit unsigned integer value. Enum value is 3.")]
Byte = 3,
/// <summary>
/// A 16 bit signed integer value. Enum value is 4.
/// </summary>
[Description("A 16 bit signed integer value. Enum value is 4.")]
Int16 = 4,
/// <summary>
/// A 16 bit signed integer value. Enum value is 5.
/// </summary>
[Description("A 16 bit signed integer value. Enum value is 5.")]
UInt16 = 5,
/// <summary>
/// A 32 bit signed integer value. Enum value is 6.
/// </summary>
[Description("A 32 bit signed integer value. Enum value is 6.")]
Int32 = 6,
/// <summary>
/// A 32 bit unsigned integer value. Enum value is 7.
/// </summary>
[Description("A 32 bit unsigned integer value. Enum value is 7.")]
UInt32 = 7,
/// <summary>
/// A 64 bit signed integer value. Enum value is 8.
/// </summary>
[Description("A 64 bit signed integer value. Enum value is 8.")]
Int64 = 8,
/// <summary>
/// A 64 bit unsigned integer value. Enum value is 9.
/// </summary>
[Description("A 64 bit unsigned integer value. Enum value is 9.")]
UInt64 = 9,
/// <summary>
/// An IEEE single precision (32 bit) floating point value. Enum value is 10.
/// </summary>
[Description("An IEEE single precision (32 bit) floating point value. Enum value is 10.")]
Float = 10,
/// <summary>
/// An IEEE double precision (64 bit) floating point value. Enum value is 11.
/// </summary>
[Description("An IEEE double precision (64 bit) floating point value. Enum value is 11.")]
Double = 11,
/// <summary>
/// A sequence of Unicode characters. Enum value is 12.
/// </summary>
[Description("A sequence of Unicode characters. Enum value is 12.")]
String = 12,
/// <summary>
/// An instance in time. Enum value is 13.
/// </summary>
[Description("An instance in time. Enum value is 13.")]
DateTime = 13,
/// <summary>
/// A 128-bit globally unique identifier. Enum value is 14.
/// </summary>
[Description("A 128-bit globally unique identifier. Enum value is 14.")]
Guid = 14,
/// <summary>
/// A sequence of bytes. Enum value is 15.
/// </summary>
[Description("A sequence of bytes. Enum value is 15.")]
ByteString = 15,
/// <summary>
/// An XML element. Enum value is 16.
/// </summary>
[Description("An XML element. Enum value is 16.")]
XmlElement = 16,
/// <summary>
/// An identifier for a node in the address space of a UA server. Enum value is 17.
/// </summary>
[Description("An identifier for a node in the address space of a UA server. Enum value is 17.")]
NodeId = 17,
/// <summary>
/// A node id that stores the namespace URI instead of the namespace index. Enum value is 18.
/// </summary>
[Description("A node id that stores the namespace URI instead of the namespace index. Enum value is 18.")]
ExpandedNodeId = 18,
/// <summary>
/// A structured result code. Enum value is 19.
/// </summary>
[Description("A structured result code. Enum value is 19.")]
StatusCode = 19,
/// <summary>
/// A string qualified with a namespace. Enum value is 20.
/// </summary>
[Description("A string qualified with a namespace. Enum value is 20.")]
QualifiedName = 20,
/// <summary>
/// A localized text string with a locale identifier. Enum value is 21.
/// </summary>
[Description("A localized text string with a locale identifier. Enum value is 21.")]
LocalizedText = 21,
/// <summary>
/// An opaque object with a syntax that may be unknown to the receiver. Enum value is 22.
/// </summary>
[Description("An opaque object with a syntax that may be unknown to the receiver. Enum value is 22.")]
ExtensionObject = 22,
/// <summary>
/// A data value with an associated quality and timestamp. Enum value is 23.
/// </summary>
[Description("A data value with an associated quality and timestamp. Enum value is 23.")]
DataValue = 23,
/// <summary>
/// Any of the other built-in types. Enum value is 24.
/// </summary>
[Description("Any of the other built-in types. Enum value is 24.")]
Variant = 24,
/// <summary>
/// Diagnostic information associated with a result code. Enum value is 25.
/// </summary>
[Description("Diagnostic information associated with a result code. Enum value is 25.")]
DiagnosticInfo = 25,
/// <summary>
/// Any numeric value. Enum value is 26.
/// </summary>
[Description("Any numeric value. Enum value is 26.")]
Number = 26,
/// <summary>
/// A signed integer. Enum value is 27.
/// </summary>
[Description("A signed integer. Enum value is 27.")]
Integer = 27,
/// <summary>
/// An unsigned integer. Enum value is 28.
/// </summary>
[Description("An unsigned integer. Enum value is 28.")]
UInteger = 28,
/// <summary>
/// An enumerated value. Enum value is 29.
/// </summary>
[Description("An enumerated value. Enum value is 29.")]
Enumeration = 29
}
}
So, in principle, you could recognize the built-in type if following conditions are all true:
- the namespace index is zero (.NamespaceIndex = 0), and
- the data type Id is numeric (.NodeIdType = UANodeIdType.UANodeIdType.Numeric), and
- the numeric identifier is less than or equal to 29 (.NumericIdentifier <= 29).
Regards
