class AzureBlob::BlockList

def build_document
  document = Document.new
  document.add(XMLDecl.new("1.0", "utf-8"))
  block_list = document.add_element(Element.new("BlockList"))
  blocks.each do |block_id|
    block = block_list.add_element(Element.new("Latest"))
    block.text = block_id
  end
  document
end