By mistake added to Part 5 - but this belongs to Part 8. Unable to edit the issue, hence adding a comment here.

The quantity model has been specified together with VDMA experts. These experts specifically opposed the selection of a specific unit system (like UCUM, QUDT, UNECE, ...). Based on their experience, different industries use different unit systems.
Because of this, we are not able to define an identifier. Instead, we recommend to use quantity name or quantity symbol (or both) in structures.

Hi Karl,

Thanks for your inputs.
In that case, is there a possibility that, names of quantiy names can be atleast defined in a standard way or as an extensible enumueration by having MultiStateDiscreteType with list of known names.

As the quantity names NEED NOT have to be dependent directly on the Unit System.

Examples: We have DISTANCE, FORCE, SPEED, TIME, NUMBER, TORQUE, ANGLE, PRESSURE, TEMPERATURE, etc. These are the quantity names or symbols and if we have simplied standard name or MultiStateDiscreteType for these symbols, then we can directly include that as a property in the Structure.

Example: DISTANCE is a quantity and Units can be KM or MILES or METERS, etc. but Quantity Name is same in that case.

Please check with Carsten Born <Carsten.Born@vitronic.com> and Waszkewitz Peter (BCI/ESW18) <Peter.Waszkewitz@de.bosch.com>. They are experts and have designed the existing model. They will also know whether names can be unique and / or are also localizable.

Hi,
I had a discussion with Carsten and Suprateek and during discussion, if someone needs to use this model in the Structures, then the suggestion is to use SyntaxReferenceEntryType instance as a FIELD inside the structure as defined https://reference.opcfoundation.org/Core/Part8/v105/docs/6.3

For now, we have no action from IJT CS and that is already published and in future, if we change the existing structures, we will try to use it.
For others who want to utilize the model can use the above option.

The only point which is NOT clear to me is:
In the following link: https://reference.opcfoundation.org/Core/Part8/v105/docs/6.3, there is a following Table: Table 34 – Definition of NodeId for instances of the SyntaxReferenceEntryType.
Based on the content, it looks like a Structure (Data Type) but I am NOT able to find a specific Data Type for this if we want to use this part of Structures.