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A WebComponent specifies all its properties under the model, all the events under handlers and api has the javascript api the webcomponent has that the server can call.

Types are defining internal complex object that describe a type that can be used as in a properties type description types that are used by this webcomponent for one or more of its properties.  (for example a tabpanel component has a tab type that describes one tab inside the tabpanel) besides . They have the same support as under model:{}, there is no support for api or handlers on those types again because they are just container objects that push data to the webcomponent from the server.

Besides that the type description can be a simple type like:

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