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Unity Engine

Define a namespace prefix

Use UxmlNamespacePrefix attribute to define a namespace prefix.
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After you have defined a custom control element, you can use it in your UXML files. To categorize elements, create the class in a namespace. When you define a new namespace, you can define a prefix for the namespace. You must define namespace prefixes as attributes of the root 
<UXML>
element and replace the full namespace name when scoping elements.
To define a namespace prefix, add a 
UxmlNamespacePrefix
attribute to your assembly for each namespace prefix. For example:
[assembly: UxmlNamespacePrefix("My.First.Namespace", "first")][assembly: UxmlNamespacePrefix("My.Second.Namespace", "second")]
You can do this at the root level (outside any namespace) of any C# file of the assembly.
The schema generation system does the following:
  • Checks for these attributes and uses them to generate the schema.
  • Adds the namespace prefix definition as an attribute of the 
    <UXML>
    element in newly created UXML files.
  • Includes the schema file location for the namespace in its 
    xsi:schemaLocation
    attribute.
To ensure that your text editor recognizes the new element, select Assets > Update UXML Schema to update the schema definition.
To create a new UXML document with the prefix, select Assets > Create > UI Toolkit > UI Document (UXML).

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