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ObjectTypeNode

Canonical path: o6.node.ObjectTypeNode

ObjectTypeNode

Bases: Node

Node representing an OPC UA ObjectType.

Browsing it walks the type's own instance declarations, so it shows what an instance of the type will contain rather than any one instance's children.

Functions

__init__ 

__init__(backend, nodeId, browseName)

Wrap an existing node. Handles come from a client, server, or browsing.

Parameters:

Name Type Description Default
backend Any

The client or server backend that carries out operations.

 required
nodeId NodeIdLike

NodeId of the node.

 required
browseName QualifiedName

BrowseName of the node.

 required

__lshift__ 

__lshift__(other)

Reject event emission on any NodeClass but Object and View.

Overridden by ObjectNode and ViewNode -- the only NodeClasses OPC UA defines an EventNotifier attribute for -- with the real implementation.

__call__ 

__call__(value=_UNSET, attr=None)

Read or write one attribute of this node.

Called without a value it reads, and with a value it writes. The attribute defaults to Value. Reads return values for all Good-severity statuses and raise for Uncertain or Bad; use the owning client/server's read(..., valueOnly=False) to inspect status and timestamp metadata.

Parameters:

Name Type Description Default
value Any

The value to write. Omit it to read instead.

 _UNSET
attr Optional[AttributeId | str]

The attribute to address, as an o6.AttributeId or a case-insensitive attribute name such as "browseName".

 None

Returns:

Type Description
MaybeAwaitable[Any]

The attribute value when reading, None when writing. Async tasks
MaybeAwaitable[Any]

always receive an awaitable, including for immediate local results.

Raises:

Type Description
StatusCodeError

The read or write operation failed.

__getitem__ 

__getitem__(key)

Resolve a browse path relative to this node.

Use this where attribute access cannot reach: a BrowseName that is not a Python identifier, an ambiguous name, or a multi-step relative path.

Parameters:

Name Type Description Default
key str | 'ns0.datatypes.RelativePath'

A relative-path string such as "1:DeviceSet/1:Motor", or a ns0.datatypes.RelativePath.

 required

Returns:

Type Description
MaybeAwaitable[list[Any]]

Every node the path resolves to, as a list; awaitable in async tasks.

Raises:

Type Description
KeyError

The path matches no node.