code: public final DateList getDates(final Date seed, final Period period,
                                     final Value value) {
          return getDates(seed, period.getStart(), period.getEnd(), value, -1);
      }
docs: Convenience method for retrieving recurrences in a specified period.
  
  @param seed   a seed date for generating recurrence instances
  @param period the period of returned recurrence dates
  @param value  type of dates to generate
  @return a list of dates