+ <rng:define name="modifiable">
+ <rng:optional>
+ <!-- @modifiers contains a JSON map unifying the various
+ modifier attributes: @readonly, @required, @invisible.
+ Each attribute is a key, mapped to a JSON list representing
+ a condition expressed as an OpenERP `domain` filter
+ Only some of the modifier keys make sense on some
+ elements, for example <filter> and <group> only support
+ `invisible`. -->
+ <rng:attribute name="modifiers"/>
+ </rng:optional>
+ </rng:define>
+