Contract
Parameter key	Default value	Type
containing_object	req	wob
fieldname	req	string
style	opt	opt
onload	opt	type.<one_of string hypertext.script/>
onunload	opt	type.<one_of string hypertext.script/>
onchange	opt	type.<one_of string hypertext.script/>
layout	opt	layout
ui_view	opt
accepts_drops_of	opt	wob
draggable	opt	boolean
resizeable	false	boolean
cache	false	boolean
a_type	string	wob
which	opt	integer

Water Contract
<class biz.auto_field.radio which =opt=number.integer />

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