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Every method call on a tree is directed at the @Root@ which holds a dictionary of its leafs and calls the appropriate object. h3. Type safety Since objects are typed, the @Root@ is responsible for verifying type compatibility before calling the object.

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Once a @Root@ has called an object, it notifies all the registered commands with the called path and the returned value so that the "commands":198 can notify all their observers.

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When a @Root@'s "send" method is called with a remote "":223. The @Root@ is responsible for routing the message to the appropriate object or proxy object depending on the protocol. For example, you might have an @OscCommand@ registered for the "osc" protocol, an @HTTPCommand@ for "http" and a @PipeCommand@ for "whatever". With these commands in place, @Root@ can forward the messages depending on the protocol used to reach the remote object. When a "":205 is sent to a remote object, it is actually sent to an "":208 which is in turn responsible to asynchronously update the remote object. osc://daisy.local/gain ---> OscCommand --> [daisy.local RootProxy] http://"elphel1"/resolution ---> HTTPCommand --> ["elphel1" RootProxy] whatever://buz.local/schmok ---> PipeCommand --> [buz.local RootProxy] /blah/fox ---> same tree, no Command used You can have a look at "":189 for details on url formats.

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When an object is inserted into an "execution" tree, it is adopted by it's parent. This means that when a parent is deleted, all its children are also destroyed. As the name implies, the @Root@ has no parent and is the parent of all objects in the tree. This implies that destroying the root effectively destroys the tree. h3. Commands A @Root@ also adopts "Commands":198 (gates to the outside world). These are also destroyed with the @Root@.