What is the syntax for creating a radio button?

[slead]

I'm adding a custom profile as described at https://github.com/Esri/geoportal-server/wiki/Add-a-Custom-Profile#Obligation_rules and I'd like to implement a radio button, ie a list which only allows one element to be selected.

<input type="selectManyCheckbox"/> will create checkboxes:

and <input type="selectOneMenu"/> creates a dropdown menu:

What is the syntax for creating a radio button checklist, eg:

thanks