It's clear that all <xen: tags have been created for the purposes of making a developer's life easier, yet not all <xen: tags can be used in all types of template.
In the Admin Templates although you can use tags such as:
If I wanted to produce this:

In an admin template this takes 8 lines of code.
In a public template, the exact same thing takes 32 lines of code.
Although these elements aren't widely used in public templates, they can still be useful.
Especially for add-on developers.
In the Admin Templates although you can use tags such as:
- <xen:radiounit>
- <xen:hint>
- <xen:option>
- <xen:textbox>
- <xen:spinbox>
- and many more...
If I wanted to produce this:

In an admin template this takes 8 lines of code.
In a public template, the exact same thing takes 32 lines of code.
Although these elements aren't widely used in public templates, they can still be useful.
Especially for add-on developers.
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