code: public Predicate newPredicate(Span<Term> span) {
  	String newId = idManager.getNextId(AnnotationType.PREDICATE);
  	Predicate newPredicate = new Predicate(newId, span);
  	annotationContainer.add(newPredicate, Layer.SRL, AnnotationType.PREDICATE);
  	return newPredicate;
      }
docs: Creates a new srl predicate. It assigns an appropriate ID to it. The predicate is added to the document.
  @param span span containing all the targets of the predicate
  @return a new predicate