Must Enumeration definitions in a Node Set provide EnumStrings or EnumValues?|OPC UA Standard|Forum|OPC Foundation

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Must Enumeration definitions in a Node Set provide EnumStrings or EnumValues?
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Markus Horstmann
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06/20/2023 - 14:12
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Consider this declaration:

  <UADataType NodeId=”ns=1;g=3adbe6d1-d00c-4483-9625-fb323383d7a2″ BrowseName=”1:TestEnum1″>
    <DisplayName>TestEnum1</DisplayName>
    <Description></Description>
    <Category>Base Info Base Types</Category>
    <References>
      <Reference ReferenceType=”HasSubtype” IsForward=”false”>Enumeration</Reference>
    </References>
    <Definition Name=”1:TestEnum1″>
      <Field Name=”Enum1″ Value=”1″>
        <DisplayName></DisplayName>
        <Description></Description>
      </Field>
      <Field Name=”Enum2″ Value=”2″>
        <DisplayName></DisplayName>
        <Description></Description>
      </Field>
    </Definition>
  </UADataType>
An EnumStrings or EnumValues does not seem to provide any additional information, and the specification (UA Part 3: Address Space Model – 5.8.3 DataType NodeClass (newwebsite.opcfoundation.org)) marks them as optional.
 
Is it a correct reading that these properties are optional for enumeration types, or would an authoring tool be better off generating these?
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Randy Armstrong
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06/20/2023 - 19:58
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From: https://reference.opcfoundatio…..docs/5.8.3

 

Enumeration DataTypes shall have either an EnumStrings Property or an EnumValues Property. They shall not be applied for other DataTypes.

The Definition is used to populate the DataTypeDefinition Attribute which results in some duplication of information. Tools need to generate both.

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Markus Horstmann
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06/21/2023 - 17:53
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Randy Armstrong said
From: https://reference.opcfoundatio…..docs/5.8.3

 

Enumeration DataTypes shall have either an EnumStrings Property or an EnumValues Property. They shall not be applied for other DataTypes.

The Definition is used to populate the DataTypeDefinition Attribute which results in some duplication of information. Tools need to generate both.

  

Oops, I overlooked that sentence. Thanks for helping me read the spec!

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