anchor.diff:  public interface SopDocumentContentRepository extends ContentRepository<SopDocument, UUID>, Renderable<SopDocument> {
   }
   ----
  -
   . Set up Spring to create proxy instances for these two interfaces using JavaConfig:
   +
   [source, java]
  
positive.code: Content repositories can therefore optionally also be given rendition capabilities by extending the `Renderable<E>` interface.
  
  [source, java]
  +
  .Renderable interface
  ----
  public interface Renderable<E> {
  
negative.code: Content repositories can therefore optionally be made searchable by extending the `Searchable<CID>` interface.
  
  [source, java]
  ----
  public interface Searchable<CID> {
  
  