def index(i=nil, &blk) 
      @index = i || blk if i || !blk.nil?
      @index ||= Familia.index
      @index
    end
def index(i=nil, &blk) 
      @index = i || blk if i || !blk.nil?
      @index ||= Familia.index
      @index
    end
TODO: grab db, ttl, uri from parent
def parent=(a) @parent = a end
def parent(a=nil) @parent = a if a; @parent end