anchor.diff:  
   [[nsa-filter-chain-filters]]
   * **filters**
  -A comma separated list of references to Spring beans that implement `Filter`. The value "none" means that no `Filter`'s should be used for this `FilterChain`.
  +A comma separated list of references to Spring beans that implement `Filter`. The value "none" means that no `Filter` should be used for this `FilterChain`.
   
   
   [[nsa-filter-chain-pattern]]
  
positive.code: 
  [[nsa-filter-chain-request-matcher-ref]]
  * **request-matcher-ref**
  A reference to a `RequestMatcher` that will be used to determine if the `Filter`'s from the `filters` attribute should be invoked.
  
  
  [[nsa-filter-security-metadata-source]]
  
negative.code: * **ref**
  Defines a reference to a Spring bean that implements `AuthenticationProvider `.
  
  If you have written your own `AuthenticationProvider` implementation (or want to configure one of Spring Security's own implementations as a traditional bean for some reason, then you can use the following syntax to add it to the internal list of `ProviderManager`:
  
  [source,xml]
  ----
  