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NamespaceUris specification
Joao Carlos Bastos Portela
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Forum Posts: 1
Member Since:
08/11/2025
08/11/2025
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08/11/2025 - 09:10
Does the `Uri`s inside `NamespaceUris` need to follow/comply with some ordering when the Nodesets defining the namespaces of the `Uri`s depend on each other?
Clarifying the question:
Imagine the namespace `urn:my:org:inf_model` contains:
<NamespaceUris>
<Uri>urn:my:org:inf_model</Uri>
<Uri>urn:dep2</Uri>
<Uri>urn:dep1</Uri>
</NamespaceUris>
<Models>
<Model PublicationDate="2025-06-18T14:58:48Z" Version="0.0.0" ModelUri="urn:my:org:inf_model">
<RequiredModel PublicationDate="1900-01-01T00:00:00" Version="1.04" ModelUri="https://opcfoundation.org/UA/"/>
<RequiredModel PublicationDate="2021-07-21T07:40:34Z" Version="2.2" ModelUri="urn:dep2"/>
<RequiredModel PublicationDate="2021-07-21T07:40:34Z" Version="2.2" ModelUri="urn:dep1"/>
</Model>
</Models>
And `urn:dep2` contains:
<NamespaceUris>
<Uri>urn:dep2</Uri>
<Uri>urn:dep1</Uri>
</NamespaceUris>
<Models>
<Model PublicationDate="2025-06-18T14:58:48Z" Version="0.0.0" ModelUri="urn:dep2">
<RequiredModel PublicationDate="1900-01-01T00:00:00" Version="1.04" ModelUri="https://opcfoundation.org/UA/"/>
<RequiredModel PublicationDate="2021-07-21T07:40:34Z" Version="2.2" ModelUri="urn:dep1"/>
</Model>
</Models>
And `urn:dep1` has not other dependencies.
So here we see that `urn:dep2` depends on `urn:dep1`; `urn:my:org:inf_model` depends on both `urn:dep1` and `urn:dep2`, but on the `NamespaceUris` of `urn:my:org:inf_model` the `urn:dep1` comes before `urn:dep2`.
Why I ask: because with one of the open source OPC UA server SDKs I having issues loading such nodesets and I am wondering if the issue is on the nodeset design or if the server SDK needs to be adjusted/fixed.
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