def parse(node)
      @file_reference = FileReference.new(parent: self).parse(node)
      @name = node.attribute('name').value
      self
    end
def parse(node)
      @file_reference = FileReference.new(parent: self).parse(node)
      @name = node.attribute('name').value
      self
    end
Parse Sound
 @param [Nokogiri::XML:Node] node with NumberingProperties
 @return [Sound] result of parsing