code: public List<Way> getWays(Collection<Long> wayIds)
  	{
  		if(wayIds.isEmpty()) return Collections.emptyList();
  		return getSomeElements(WAY + "s?" + WAY + "s=" + toCommaList(wayIds), Way.class);
  	}
docs: Note that if not logged in, the Changeset for each returned element will be null
  
  @param wayIds a collection of way ids to return
  @throws OsmNotFoundException if <b>any</b> one of the given ways does not exist
  @return a list of ways.