Hi ,
I have created AAA Object with type definition MotionDeviceType by client SDK, and it will generate mandatory properties (such as ParameterSet and SpeedOverride) in Objects folder. If I get the node ID of AAA Object and query its type definition, it will return the nodeID of MotionDeviceType below ObjectsTypes folder. But if I get the node ID of ParameterSet Object and query its type definition, it will return the BaseObjectType or PropertyType, NOT the Node ID of ObjectType.

Matti Siponen said
Hello,

The ObjectType of ParameterSet is BaseObjectType. Instead of trying to find the NodeId of the ObjectType of an Object Node, could it be that what you actually want to find is the NodeId of the InstanceDeclaration of the Node called “A ParameterSet” in your figure?

Complex ObjectTypes, such as MotionDeviceType, can declare References to other Nodes with predetermined BrowseNames and TypeDefinitions. While these InstanceDeclaration Nodes can be Referenced by ObjectTypes and VariableTypes, they themselves are not ObjectType or VariableType Nodes.

If you wish to find the NodeId of the InstanceDeclaration that “A ParameterSet” is based on, you need to take the following steps:

1. Store the BrowseName of “A ParameterSet”, you will need it later for comparison. You can get the BrowseName with AAA.getParameterSetNode().getBrowseName().
2. Find the ObjectType Node targeted by “AAA” with HasTypeDefinition Reference. You can do this with AAA.getTypeDefinition().
3. Browse the MotionDeviceType for References with AAA.getTypeDefinition().getReferences().
4. Find a Node amongst the References with the same BrowseName as “A ParameterSet”. You can compare BrowseNames with equals().
5. This Node is the InstanceDeclaration you’re looking for and you can get its NodeId with getNodeId().

This is how you would do it in your specific case. However, the general case of finding an InstanceDeclaration’s NodeId based on a NodeId of its instance is a complex algorithm to implement especially when subtyping is involved.

Are you looking for the general algorithm or just a solution for this specific case?

BR,

Matti  

Hi,
Thanks for your suggestion. Finally , we decide to solve this problem after adding new node and do something.
1. I got the MotionDeviceType Object type to create AAA object and save this Object type Node ID in HasDescription Reference type.
2. Query all subtype of this Object type ID recursively that I will get it’s all references and save them as well.
3. Compare the browse name of A ParameterSet and speedoverride properties and save the object type ID in HasDescription Reference type of them as well.

It works for me. Thanks.