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docs(guide): update the diagram
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docs/content/guide/dev_guide.di.understanding_di.ngdoc

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In the illustration above, the dependency injection sequence proceeds as follows:
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1. Service factory functions are registered with angular's service factory repository.
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2. `ng:app` triggers angular's bootstrap sequence, during which angular compiles the template,
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creates the root scope, and creates the dependency injector.
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3. The `ng:controller` directive implicitly creates a new child scope, augmented by the application
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of the `PhoneListCtrl` controller function.
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4. The Injector identifies the `$xhr` service as `PhoneListCtrl` controller's only dependency.
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5. The Injector checks if the `$xhr` service has already been instantiated, and if not uses the
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factory function from the service factory repository to construct it.
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6. DI provides the instance of $xhr service to the PhoneListCtrl controller constructor
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1. Module "phonecat" is created and all the service providers are registered with this module.
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(the "ng" module is created by Angular behind the scenes as well)
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2. `ng:app` triggers bootstrap sequence on given element, during which angular creates injector,
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loads "phonecat" and "ng" modules and compiles the template.
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3. The `ng:controller` directive implicitly creates a new child scope and instantiates
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`PhoneListCtrl` controller.
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4. Injector identifies the `$http` service as `PhoneListCtrl` controller's only dependency.
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5. Injector checks its instances cache whether the `$http` service has already been instantiated.
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If not uses the provider from the available modules to construct it.
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6. Injector provides the instance of `$http` service to the `PhoneListCtrl` controller constructor.
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## How Scope Relates to DI
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