code: public void registerEntityDocumentProcessor(
  			EntityDocumentProcessor entityDocumentProcessor, String model,
  			boolean onlyCurrentRevisions) {
  		registerProcessor(entityDocumentProcessor, model, onlyCurrentRevisions,
  				this.entityDocumentProcessors);
  	}
docs: Registers an EntityDocumentProcessor, which will henceforth be notified
  of all entity documents that are encountered in the dump.
  <p>
  It is possible to register processors for specific content types and to
  use either all revisions or only the most current ones. This
  functionality is only available when processing dumps that contain this
  information. In particular, plain JSON dumps do not specify content
  models at all and have only one (current) revision of each entity.
  
  @param entityDocumentProcessor
  the entity document processor to register
  @param model
  the content model that the processor is registered for; it
  will only be notified of revisions in that model; if null is
  given, all revisions will be processed whatever their model
  @param onlyCurrentRevisions
  if true, then the subscriber is only notified of the most
  current revisions; if false, then it will receive all
  revisions, current or not