code: public ElementHandling getHandling( PomProperty<?> property )
      {
          ElementHandling handling = this.name2handlingMap.get( property.getName() );
          if ( handling == null )
          {
              handling = ElementHandling.flatten;
          }
          return handling;
      }
docs: Generic method to get a {@link ElementHandling}.
  
  @param property is the {@link PomProperty} such as {@link PomProperty#NAME}.
  @return the {@link ElementHandling}. Will be {@link ElementHandling#flatten flattened} as fallback if undefined.