Provides a group of widgets, only one of which may be selected at any time. To indicate that a radio buttons are part of the same group, simply set the same "group" attribute in the tag. Note that all radio buttons of the same group should be on the same form; the behaviour if they're not is undefined.
The interaction with database fields is not so smooth; if you wish to control boolean fields, a checkbox is probably a better idea (although it will work if you assign one boolean field to each radio button). Likewise, if you wish to control a field with multiple possbile values a dropdown is your best approach.
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