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Is it possible to have a node at multiple location in the 'tree'
January 11, 2022
11:26, EET
rocket science
Forum Posts: 52
Member Since:
March 16, 2017
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just would like to ask if it is possible to have a node at muliple location in the objects tree?

e.g. Node1 is located at Folder-A and at Folder-B

 + Objects
   + Folder-A
     + Node1 (ns=1;s=Node1)
     + NodeX (ns=1;s=NodeX)
   + Folder-B
     + Node1 (ns=1;s=Node1)
     + NodeY (ns=1;s=NodeY)
 + Types
 + Views


January 11, 2022
12:11, EET
Bjarne Boström
Forum Posts: 726
Member Since:
April 3, 2012
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Yes, it is basically more of a “network” than a “tree”, except that the Root (under which the Objects/Types/Views nodes are) node is the root of hierarchical references (at least like 99% of the time, there are some weird things in the old DataTypeDictionary references etc.). You can even have loops. Note that the NodeClass/TypeDefinition/ReferenceType can limit what is allowed.

But at least making a “filesystem” out of folders and refering stuff “at will” with the Organizes ReferenceType (https://reference.opcfoundation.org/Core/docs/Part3/7.11/) from them can refer basically any node.

And I guess the only easy way unfortunately is to read at least Part3+Part5 for the different ReferenceType’s (or any companion specification if using ReferenceTypes from those) rules.

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