Modelling a tree structure with the Composite pattern?|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

Dear All,

Modelling an address space I came across a situation where the classical composite pattern might be helpful (e.g. according to https://en.wikipedia.org/wiki/.....te_pattern). However, I don't seem to find a suitable way to do that in OPC-UA. Maybe I don't see the obvious solution?

Things I currently think are the case:

1. It is not possible to model an object or variable which contains an array of objects or variables. Only data assigned to a Variable (DataType) can be declared as an array (via ValueRank and ArrayDimension which don't exist for Objects and Variables).
2. Point 1 prevents the composite pattern at the level of Objects and Variables because the Composite object/variable needs to be able to keep a list of Component objects/variables.
3. Because of 1 and 2, I'm left with DataType Structures. Starting with a DataType derived from Structure I can create something akin to a composite structure, but it doesn't feel right to do it at that level.

Any comments, hints how to model a generic tree structure are much appreciated.

Best regards,

Jonas