anchor.diff:  In addition to bean definitions that contain information on how to create a specific
   bean, the `ApplicationContext` implementations also permit the registration of existing
   objects that are created outside the container (by users). This is done by accessing the
  -ApplicationContext's BeanFactory through the `getBeanFactory()` method, which returns the
  -BeanFactory `DefaultListableBeanFactory` implementation. `DefaultListableBeanFactory`
  -supports this registration through the `registerSingleton(..)` and
  -`registerBeanDefinition(..)` methods. However, typical applications work solely with beans
  -defined through regular bean definition metadata.
  +ApplicationContext's `BeanFactory` through the `getBeanFactory()` method, which returns
  +the `DefaultListableBeanFactory` implementation. `DefaultListableBeanFactory` supports
  +this registration through the `registerSingleton(..)` and `registerBeanDefinition(..)`
  +methods. However, typical applications work solely with beans defined through regular
  +bean definition metadata.
   
   [NOTE]
   ====
  
positive.code: * Application-layer specific contexts such as the `WebApplicationContext`
  for use in web applications.
  
  In short, the `BeanFactory` provides the configuration framework and basic
  functionality, and the `ApplicationContext` adds more enterprise-specific functionality.
  The `ApplicationContext` is a complete superset of the `BeanFactory` and is used
  exclusively in this chapter in descriptions of Spring's IoC container. For more
  information on using the `BeanFactory` instead of the `ApplicationContext,` see
  <<beans-beanfactory>>.
  
  In Spring, the objects that form the backbone of your application and that are managed
  by the Spring IoC container are called beans. A bean is an object that is
  
negative.code: 
  
  [[beans-beanfactory]]
  == The `BeanFactory` API
  
  The `BeanFactory` API provides the underlying basis for Spring's IoC functionality.
  Its specific contracts are mostly used in integration with other parts of Spring and
  